| 1 | """ |
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| 2 | Cobra Notepad Sample |
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| 3 | by Todd A., Charles Esterbrook |
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| 4 | |
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| 5 | This program is a basic text editor written with Cobra and the Windows Presentation Framework (WPF). |
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| 6 | """ |
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| 7 | |
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| 8 | @args lib:'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0' |
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| 9 | @ref 'PresentationFramework' |
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| 10 | @ref 'PresentationCore' |
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| 11 | @ref 'WindowsBase' |
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| 12 | |
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| 13 | use System.ComponentModel |
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| 14 | use System.Windows |
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| 15 | use System.Windows.Controls |
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| 16 | use System.Windows.Controls.Primitives |
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| 17 | use System.Windows.Documents |
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| 18 | use System.Windows.Input |
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| 19 | use System.Windows.Media |
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| 20 | use System.Windows.Threading |
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| 21 | use Microsoft.Win32 |
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| 22 | |
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| 23 | |
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| 24 | class CustomCommands |
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| 25 | |
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| 26 | shared |
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| 27 | |
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| 28 | var increaseFontSize = RoutedCommand('IncreaseFontSize', CustomCommands.getType, _ |
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| 29 | InputGestureCollection([KeyGesture(Key.OemPlus, ModifierKeys.Control, 'Ctrl++')])) |
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| 30 | |
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| 31 | var decreaseFontSize = RoutedCommand('DecreaseFontSize', CustomCommands.getType, _ |
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| 32 | InputGestureCollection([KeyGesture(Key.OemMinus, ModifierKeys.Control, 'Ctrl+-')])) |
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| 33 | |
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| 34 | var resetFontSize = RoutedCommand('ResetFontSize', CustomCommands.getType, _ |
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| 35 | InputGestureCollection([KeyGesture(Key.D0, ModifierKeys.Control)])) |
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| 36 | |
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| 37 | |
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| 38 | sig CanExecuteMethod(sender, e as CanExecuteRoutedEventArgs) |
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| 39 | |
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| 40 | sig ExecutedMethod(sender, e as ExecutedRoutedEventArgs) |
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| 41 | |
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| 42 | sig RoutedMethod(sender, e as RoutedEventArgs) |
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| 43 | |
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| 44 | |
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| 45 | class MainWindow inherits Window |
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| 46 | |
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| 47 | var _path as String? |
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| 48 | var _isModified as bool |
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| 49 | var _textBox as TextBox |
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| 50 | var _status as TextBlock |
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| 51 | var _filters = 'All Files|*.*;*|Config|*.conf;*.config|Text|*.txt;*.text' |
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| 52 | |
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| 53 | cue init |
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| 54 | base.init |
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| 55 | .buildLayout |
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| 56 | .bindCommands |
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| 57 | .path = nil |
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| 58 | |
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| 59 | listen _textBox.textChanged, ref .textChangeHandler |
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| 60 | listen .loaded, ref .loadedHandler |
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| 61 | listen .closing, ref .closingHandler |
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| 62 | |
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| 63 | get appName as String |
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| 64 | return 'Cobra Notepad Sample' |
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| 65 | |
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| 66 | get fileName as String? |
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| 67 | return if(.path, Path.getFileName(.path), 'Untitled') |
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| 68 | |
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| 69 | pro path as String? |
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| 70 | get |
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| 71 | return _path |
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| 72 | set |
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| 73 | _path = value |
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| 74 | if _path |
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| 75 | fileName = Path.getFileName(_path) |
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| 76 | dirName = Path.getDirectoryName(_path) |
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| 77 | .title = '[.appName] - [fileName] - [dirName]' |
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| 78 | else |
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| 79 | .title = '[.appName] - Untitled' |
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| 80 | |
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| 81 | pro status as String |
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| 82 | get |
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| 83 | return _status.text ? '' |
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| 84 | set |
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| 85 | _status.text = '[value] ([DateTime.now])' |
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| 86 | |
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| 87 | def loadedHandler(sender, e as RoutedEventArgs) |
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| 88 | _textBox.focus |
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| 89 | _textBox.fontFamily = FontFamily('Consolas') |
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| 90 | |
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| 91 | def closingHandler(sender, e as CancelEventArgs) |
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| 92 | res = .promptUserToSave |
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| 93 | if res == MessageBoxResult.Cancel |
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| 94 | e.cancel = true |
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| 95 | return |
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| 96 | else if res == MessageBoxResult.Yes |
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| 97 | .saveFile(_path to !, _textBox.text to !) |
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| 98 | |
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| 99 | def showAbout(sender, e as RoutedEventArgs) |
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| 100 | MessageBox.show('Copyright © 2010 Cobra Language. All rights reserved.', |
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| 101 | 'About [.appName]', MessageBoxButton.OK) |
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| 102 | |
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| 103 | def buildLayout |
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| 104 | menu = .push(Menu()) |
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| 105 | |
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| 106 | .pushMenuItem('_File') |
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| 107 | if true |
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| 108 | .addMenuItem('_New', ApplicationCommands.new) |
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| 109 | .addMenuItem('_Open...', ApplicationCommands.open) |
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| 110 | .addMenuItem('_Save', ApplicationCommands.save) |
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| 111 | .addMenuItem('Save As...', ApplicationCommands.saveAs) |
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| 112 | .addSeparator |
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| 113 | .addMenuItem('_Print...', ApplicationCommands.print) |
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| 114 | .addSeparator |
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| 115 | .addMenuItem('_Exit', ApplicationCommands.close) |
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| 116 | .popItem |
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| 117 | |
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| 118 | .pushMenuItem('_Edit') |
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| 119 | if true |
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| 120 | .addMenuItem('Undo', ApplicationCommands.undo) |
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| 121 | .addMenuItem('Redo', ApplicationCommands.redo) |
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| 122 | .addSeparator |
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| 123 | .addMenuItem('Cut', ApplicationCommands.cut) |
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| 124 | .addMenuItem('Copy', ApplicationCommands.copy) |
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| 125 | .addMenuItem('Paste', ApplicationCommands.paste) |
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| 126 | .addMenuItem('Delete', ApplicationCommands.delete) |
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| 127 | .addSeparator |
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| 128 | .addMenuItem('Select All', ApplicationCommands.selectAll) |
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| 129 | .popItem |
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| 130 | |
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| 131 | .pushMenuItem('_Format') |
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| 132 | if true |
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| 133 | .pushMenuItem('Font Size') |
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| 134 | if true |
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| 135 | .addMenuItem('Increase', CustomCommands.increaseFontSize, ref .increaseFontHandler) |
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| 136 | .addMenuItem('Decrease', CustomCommands.decreaseFontSize, ref .decreaseFontHandler) |
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| 137 | .addSeparator |
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| 138 | .addMenuItem('Reset', CustomCommands.resetFontSize, ref .resetFontHandler) |
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| 139 | .popItem |
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| 140 | # .addMenuItem('Font...', ... to-do |
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| 141 | .popItem |
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| 142 | |
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| 143 | .pushMenuItem('_Help') |
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| 144 | if true |
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| 145 | .addMenuItem('About', ref .showAbout) |
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| 146 | .popItem |
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| 147 | |
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| 148 | .popItem # main menu |
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| 149 | |
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| 150 | _textBox = TextBox(acceptsReturn=true, acceptsTab=true) |
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| 151 | _textBox.verticalScrollBarVisibility = ScrollBarVisibility.Auto |
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| 152 | _textBox.horizontalScrollBarVisibility = ScrollBarVisibility.Auto |
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| 153 | listen _textBox.previewMouseWheel, ref .textMouseWheelHandler |
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| 154 | |
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| 155 | statusBar = Grid() |
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| 156 | _status = TextBlock(text='', |
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| 157 | horizontalAlignment=HorizontalAlignment.Left, |
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| 158 | margin=Thickness(5)) |
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| 159 | statusBar.children.add(_status) |
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| 160 | |
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| 161 | grid = Grid() |
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| 162 | grid.rowDefinitions.add(RowDefinition(height=GridLength.auto)) |
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| 163 | grid.rowDefinitions.add(RowDefinition()) |
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| 164 | grid.rowDefinitions.add(RowDefinition(height=GridLength.auto)) |
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| 165 | |
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| 166 | .content = grid |
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| 167 | |
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| 168 | grid.children.add(menu) |
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| 169 | grid.children.add(_textBox) |
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| 170 | grid.children.add(statusBar) |
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| 171 | |
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| 172 | Grid.setRow(menu, 0) |
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| 173 | Grid.setRow(_textBox, 1) |
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| 174 | Grid.setRow(statusBar, 2) |
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| 175 | |
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| 176 | ## Building menus |
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| 177 | |
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| 178 | var _itemsControlStack = Stack<of ItemsControl>() |
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| 179 | |
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| 180 | def push(ic as ItemsControl) as ItemsControl |
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| 181 | _itemsControlStack.push(ic) |
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| 182 | return ic |
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| 183 | |
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| 184 | def pushMenuItem(header as String) as MenuItem |
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| 185 | mi = .addMenuItem(header, nil, nil) |
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| 186 | .push(mi) |
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| 187 | return mi |
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| 188 | |
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| 189 | def addMenuItem(header as String, command as RoutedCommand?) as MenuItem |
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| 190 | return .addMenuItem(header, command, nil) |
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| 191 | |
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| 192 | def addMenuItem(header as String, handler as RoutedMethod?) as MenuItem |
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| 193 | return .addMenuItem(header, nil, handler) |
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| 194 | |
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| 195 | def addMenuItem(header as String, command as RoutedCommand?, handler as RoutedMethod?) as MenuItem |
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| 196 | mi = MenuItem(header=header, command=command) |
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| 197 | if handler, listen mi.click, RoutedEventHandler(handler) |
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| 198 | .addControl(mi) |
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| 199 | return mi |
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| 200 | |
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| 201 | def addSeparator |
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| 202 | .addControl(Separator()) |
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| 203 | |
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| 204 | def addControl(c as Control) |
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| 205 | _itemsControlStack.peek.items.add(c) |
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| 206 | |
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| 207 | def popItem as ItemsControl |
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| 208 | return _itemsControlStack.pop |
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| 209 | |
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| 210 | ## Bind commands |
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| 211 | |
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| 212 | def bindCommands |
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| 213 | .bindCommand(ApplicationCommands.new to !, ref .defaultCanExecute, ref .newExecuted) |
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| 214 | .bindCommand(ApplicationCommands.open to !, ref .defaultCanExecute, ref .openExecuted) |
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| 215 | .bindCommand(ApplicationCommands.save to !, ref .saveCanExecute, ref .saveExecuted) |
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| 216 | .bindCommand(ApplicationCommands.saveAs to !, ref .defaultCanExecute, ref .saveAsExecuted) |
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| 217 | .bindCommand(ApplicationCommands.print to !, ref .defaultCanExecute, ref .printExecuted) |
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| 218 | .bindCommand(ApplicationCommands.close to !, ref .defaultCanExecute, ref .exitExecuted) |
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| 219 | |
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| 220 | .bindCommand(ApplicationCommands.undo to !, ref .undoCanExecute, ref .undoExecuted) |
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| 221 | .bindCommand(ApplicationCommands.redo to !, ref .defaultCanExecute, ref .redoExecuted) |
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| 222 | |
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| 223 | .bindCommand(ApplicationCommands.cut to !, ref .defaultCanExecute, ref .cutExecuted) |
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| 224 | .bindCommand(ApplicationCommands.copy to !, ref .defaultCanExecute, ref .copyExecuted) |
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| 225 | .bindCommand(ApplicationCommands.paste to !, ref .defaultCanExecute, ref .pasteExecuted) |
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| 226 | |
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| 227 | .bindCommand(ApplicationCommands.delete to !, ref .defaultCanExecute, ref .deleteExecuted) |
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| 228 | |
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| 229 | .bindCommand(ApplicationCommands.selectAll to !, ref .defaultCanExecute, ref .selectAllExecuted) |
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| 230 | |
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| 231 | .bindCommand(CustomCommands.increaseFontSize, ref .defaultCanExecute, ref .increaseFontHandler) |
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| 232 | .bindCommand(CustomCommands.decreaseFontSize, ref .defaultCanExecute, ref .decreaseFontExecuted) |
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| 233 | .bindCommand(CustomCommands.resetFontSize, ref .defaultCanExecute, ref .resetFontExecuted) |
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| 234 | |
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| 235 | def bindCommand(command as ICommand, canExecute as CanExecuteMethod, executed as ExecutedMethod) |
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| 236 | cb = CommandBinding(command) |
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| 237 | listen cb.canExecute, CanExecuteRoutedEventHandler(canExecute) |
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| 238 | listen cb.executed, ExecutedRoutedEventHandler(executed) |
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| 239 | .commandBindings.add(cb) |
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| 240 | |
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| 241 | def textChangeHandler(sender, e as TextChangedEventArgs) |
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| 242 | if not _isModified |
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| 243 | _isModified = true |
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| 244 | .status = 'Modified' |
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| 245 | |
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| 246 | def increaseFontHandler(sender, e as RoutedEventArgs?) |
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| 247 | _textBox.fontSize += 1f |
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| 248 | if _textBox.fontSize > 24f, _textBox.fontSize = 24f |
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| 249 | .status = 'Increased font size.' |
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| 250 | |
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| 251 | def decreaseFontHandler(sender, e as RoutedEventArgs?) |
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| 252 | _textBox.fontSize -= 1f |
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| 253 | if _textBox.fontSize < 6f, _textBox.fontSize = 6f |
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| 254 | .status = 'Decreased font size.' |
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| 255 | |
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| 256 | def resetFontHandler(sender, e as RoutedEventArgs?) |
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| 257 | _textBox.fontSize = 12f |
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| 258 | .status = 'Reset font size.' |
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| 259 | |
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| 260 | def textMouseWheelHandler(sender, e as MouseWheelEventArgs) |
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| 261 | if (Keyboard.modifiers & ModifierKeys.Control) to int > 0 |
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| 262 | if e.delta > 0 |
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| 263 | .increaseFontHandler(nil, nil) |
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| 264 | else if e.delta < 0 |
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| 265 | .decreaseFontHandler(nil, nil) |
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| 266 | e.handled = true |
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| 267 | |
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| 268 | def defaultCanExecute(sender, e as CanExecuteRoutedEventArgs) |
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| 269 | e.canExecute = true |
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| 270 | e.handled = true |
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| 271 | |
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| 272 | def saveCanExecute(sender, e as CanExecuteRoutedEventArgs) |
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| 273 | e.canExecute = _isModified |
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| 274 | e.handled = true |
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| 275 | |
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| 276 | def undoCanExecute(sender, e as CanExecuteRoutedEventArgs) |
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| 277 | e.canExecute = _textBox.canUndo |
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| 278 | e.handled = true |
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| 279 | |
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| 280 | def redoCanExecute(sender, e as CanExecuteRoutedEventArgs) |
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| 281 | e.canExecute = _textBox.canRedo |
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| 282 | e.handled = true |
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| 283 | |
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| 284 | def newExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 285 | res = .promptUserToSave |
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| 286 | if res == MessageBoxResult.Cancel |
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| 287 | return |
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| 288 | else |
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| 289 | _textBox.text = '' |
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| 290 | .path = nil |
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| 291 | .revive |
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| 292 | .status = 'New.' |
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| 293 | e.handled = true |
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| 294 | |
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| 295 | def openExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 296 | res = .promptUserToSave |
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| 297 | if res == MessageBoxResult.Cancel |
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| 298 | return |
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| 299 | else if res == MessageBoxResult.Yes |
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| 300 | .saveFile(_path, _textBox.text) |
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| 301 | else |
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| 302 | dialog = OpenFileDialog(filter=_filters) |
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| 303 | if dialog.showDialog |
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| 304 | .path = dialog.fileName to ! |
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| 305 | _textBox.text = File.readAllText(_path) |
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| 306 | .revive |
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| 307 | .status = 'Opened.' |
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| 308 | e.handled = true |
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| 309 | |
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| 310 | def saveExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 311 | # If a path is set for the currently edited file then save the text, |
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| 312 | # else prompt the user for a filename then save to that location |
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| 313 | if _path and _isModified |
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| 314 | .saveFile(_path, _textBox.text) |
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| 315 | else if _isModified |
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| 316 | newPath = .promptSaveFileName |
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| 317 | if newPath |
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| 318 | .path = newPath |
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| 319 | .saveFile(_path, _textBox.text) |
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| 320 | e.handled = true |
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| 321 | |
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| 322 | def saveAsExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 323 | newPath = .promptSaveFileName |
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| 324 | if newPath |
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| 325 | .path = newPath |
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| 326 | .saveFile(_path, _textBox.text) |
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| 327 | |
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| 328 | def printExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 329 | dialog = PrintDialog() |
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| 330 | if dialog.showDialog |
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| 331 | .status = 'Printing...' |
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| 332 | flowDoc = FlowDocument(columnWidth=700.0f, fontFamily=FontFamily('Consolas')) |
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| 333 | lines = _textBox.text.split(c'\n') |
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| 334 | for line in lines |
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| 335 | para = Paragraph(margin=Thickness(0)) |
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| 336 | para.inlines.add(Run(line)) |
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| 337 | flowDoc.blocks.add(para) |
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| 338 | paginator = (flowDoc to IDocumentPaginatorSource).documentPaginator |
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| 339 | dialog.printDocument(paginator, _path) |
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| 340 | .status = 'Printed.' |
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| 341 | |
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| 342 | def exitExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 343 | .close |
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| 344 | |
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| 345 | def undoExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 346 | _textBox.undo |
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| 347 | e.handled = true |
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| 348 | |
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| 349 | def redoExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 350 | _textBox.redo |
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| 351 | e.handled = true |
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| 352 | |
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| 353 | def cutExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 354 | _textBox.cut |
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| 355 | e.handled = true |
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| 356 | |
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| 357 | def copyExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 358 | _textBox.copy |
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| 359 | e.handled = true |
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| 360 | |
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| 361 | def pasteExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 362 | _textBox.paste |
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| 363 | e.handled = true |
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| 364 | |
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| 365 | def deleteExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 366 | _textBox.selectedText = '' |
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| 367 | e.handled = true |
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| 368 | |
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| 369 | def selectAllExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 370 | _textBox.selectAll |
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| 371 | e.handled = true |
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| 372 | |
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| 373 | def increaseFontExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 374 | .increaseFontHandler(nil, nil) |
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| 375 | e.handled = true |
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| 376 | |
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| 377 | def decreaseFontExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 378 | .decreaseFontHandler(nil, nil) |
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| 379 | e.handled = true |
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| 380 | |
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| 381 | def resetFontExecuted(sender, e as ExecutedRoutedEventArgs) |
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| 382 | .resetFontHandler(nil, nil) |
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| 383 | e.handled = true |
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| 384 | |
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| 385 | def promptUserToSave as MessageBoxResult |
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| 386 | """ |
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| 387 | Prompt's the user to commit unsaved changes. |
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| 388 | Returns true if a save was performed, else false |
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| 389 | """ |
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| 390 | if _isModified |
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| 391 | res = MessageBox.show('Do you want to save changes to [.fileName]?', |
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| 392 | 'Save changes', MessageBoxButton.YesNoCancel) |
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| 393 | if res == MessageBoxResult.Yes |
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| 394 | # If the current file is a new file that has never been written to disk then |
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| 395 | # prompt the user to provide a name and save it. |
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| 396 | if not _path |
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| 397 | newPath = .promptSaveFileName |
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| 398 | |
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| 399 | # If the user provides a filename/path then load this path, else if they cancel the |
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| 400 | # dialog box then return a 'No' result. |
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| 401 | if newPath |
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| 402 | .path = newPath |
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| 403 | else |
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| 404 | return MessageBoxResult.No |
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| 405 | |
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| 406 | if _path and _path.trim <> '' |
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| 407 | .saveFile(_path, _textBox.text) |
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| 408 | return res |
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| 409 | |
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| 410 | return MessageBoxResult.No |
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| 411 | |
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| 412 | def promptSaveFileName as String? |
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| 413 | dialog = SaveFileDialog(filter=_filters) |
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| 414 | dialog.fileName = .fileName |
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| 415 | if dialog.showDialog |
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| 416 | newPath = dialog.fileName to ! |
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| 417 | return newPath |
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| 418 | return nil |
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| 419 | |
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| 420 | def saveFile(path as String?, content as String?) |
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| 421 | if path, File.writeAllText(path, content ? '') |
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| 422 | .revive |
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| 423 | .status = 'Saved.' |
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| 424 | |
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| 425 | def revive |
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| 426 | _isModified = false |
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| 427 | .status = '' |
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| 428 | |
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| 429 | |
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| 430 | class Program |
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| 431 | |
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| 432 | def main is shared has STAThread |
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| 433 | Program().run |
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| 434 | |
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| 435 | def run |
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| 436 | app = Application() |
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| 437 | listen app.dispatcherUnhandledException, ref .unhandledExceptionHandler |
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| 438 | app.run(MainWindow()) |
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| 439 | |
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| 440 | def unhandledExceptionHandler(sender, args as DispatcherUnhandledExceptionEventArgs) |
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| 441 | msg = 'Exception: ' + args.exception.message |
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| 442 | MessageBox.show(msg, 'Unhandled Exception', MessageBoxButton.OK) |
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| 443 | args.handled = true |
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