Qt Reference Documentation

textselection.qml Example File

declarative/text/textselection/textselection.qml
 /****************************************************************************
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 ** Contact: Nokia Corporation (qt-info@nokia.com)
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 ** This file is part of the QtDeclarative module of the Qt Toolkit.
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 import Qt 4.7

 Rectangle {
     id: editor
     color: "lightGrey"
     width: 640; height: 480

     Rectangle {
         color: "white"
         anchors.fill: parent
         anchors.margins: 20

         BorderImage {
             id: startHandle
             source: "pics/startHandle.sci"
             opacity: 0.0
             width: 10
             x: edit.positionToRectangle(edit.selectionStart).x - flick.contentX-width
             y: edit.positionToRectangle(edit.selectionStart).y - flick.contentY
             height: edit.positionToRectangle(edit.selectionStart).height
         }

         BorderImage {
             id: endHandle
             source: "pics/endHandle.sci"
             opacity: 0.0
             width: 10
             x: edit.positionToRectangle(edit.selectionEnd).x - flick.contentX
             y: edit.positionToRectangle(edit.selectionEnd).y - flick.contentY
             height: edit.positionToRectangle(edit.selectionEnd).height
         }

         Flickable {
             id: flick

             anchors.fill: parent
             contentWidth: edit.paintedWidth
             contentHeight: edit.paintedHeight
             interactive: true
             clip: true

             function ensureVisible(r) {
                 if (contentX >= r.x)
                     contentX = r.x;
                 else if (contentX+width <= r.x+r.width)
                     contentX = r.x+r.width-width;
                 if (contentY >= r.y)
                     contentY = r.y;
                 else if (contentY+height <= r.y+r.height)
                     contentY = r.y+r.height-height;
             }

             TextEdit {
                 id: edit
                 width: flick.width
                 height: flick.height
                 focus: true
                 wrapMode: TextEdit.Wrap

                 onCursorRectangleChanged: flick.ensureVisible(cursorRectangle)

                 text: "<h1>Text Selection</h1>"
                     +"<p>This example is a whacky text selection mechanisms, showing how these can be implemented in the TextEdit element, to cater for whatever style is appropriate for the target platform."
                     +"<p><b>Press-and-hold</b> to select a word, then drag the selection handles."
                     +"<p><b>Drag outside the selection</b> to scroll the text."
                     +"<p><b>Click inside the selection</b> to cut/copy/paste/cancel selection."
                     +"<p>It's too whacky to let you paste if there is no current selection."

                 MouseArea {
                     property string drag: ""
                     property int pressPos

                     x: -startHandle.width
                     y: 0
                     width: parent.width+startHandle.width+endHandle.width
                     height: parent.height

                     onPressAndHold: {
                         if (editor.state == "") {
                             edit.cursorPosition = edit.positionAt(mouse.x+x,mouse.y+y);
                             edit.selectWord();
                             editor.state = "selection"
                         }
                     }

                     onClicked: {
                         if (editor.state == "") {
                             edit.cursorPosition = edit.positionAt(mouse.x+x,mouse.y+y);
                             if (!edit.focus)
                                 edit.focus = true;
                             edit.openSoftwareInputPanel();
                         }
                     }

                     function hitHandle(h,x,y) {
                         return x>=h.x+flick.contentX && x<h.x+flick.contentX+h.width && y>=h.y+flick.contentY && y<h.y+flick.contentY+h.height
                     }

                     onPressed: {
                         if (editor.state == "selection") {
                             if (hitHandle(startHandle,mouse.x+x,mouse.y+y)) {
                                 drag = "start"
                                 flick.interactive = false
                             } else if (hitHandle(endHandle,mouse.x+x,mouse.y+y)) {
                                 drag = "end"
                                 flick.interactive = false
                             } else {
                                 var pos = edit.positionAt(mouse.x+x,mouse.y+y);
                                 if (pos >= edit.selectionStart && pos <= edit.selectionEnd) {
                                     drag = "selection"
                                     flick.interactive = false
                                 } else {
                                     drag = ""
                                     flick.interactive = true
                                 }
                             }
                         }
                     }

                     onReleased: {
                         if (editor.state == "selection") {
                             if (drag == "selection") {
                                 editor.state = "menu"
                             }
                             drag = ""
                         }
                         flick.interactive = true
                     }

                     onPositionChanged: {
                         if (editor.state == "selection" && drag != "") {
                             if (drag == "start") {
                                 var pos = edit.positionAt(mouse.x+x+startHandle.width/2,mouse.y+y);
                                 var e = edit.selectionEnd;
                                 if (e < pos)
                                     e = pos;
                                 edit.select(pos,e);
                             } else if (drag == "end") {
                                 var pos = edit.positionAt(mouse.x+x-endHandle.width/2,mouse.y+y);
                                 var s = edit.selectionStart;
                                 if (s > pos)
                                     s = pos;
                                 edit.select(s,pos);
                             }
                         }
                     }
                 }
             }
         }

         Item {
             id: menu
             opacity: 0.0
             width: 100
             height: 120
             anchors.centerIn: parent

             Rectangle {
                 border.width: 1
                 border.color: "darkBlue"
                 radius: 15
                 color: "#806080FF"
                 anchors.fill: parent
             }

             Column {
                 anchors.centerIn: parent
                 spacing: 8

                 Rectangle {
                     border.width: 1
                     border.color: "darkBlue"
                     color: "#ff7090FF"
                     width: 60
                     height: 16

                     Text { anchors.centerIn: parent; text: "Cut" }

                     MouseArea {
                         anchors.fill: parent
                         onClicked: { edit.cut(); editor.state = "" }
                     }
                 }

                 Rectangle {
                     border.width: 1
                     border.color: "darkBlue"
                     color: "#ff7090FF"
                     width: 60
                     height: 16

                     Text { anchors.centerIn: parent; text: "Copy" }

                     MouseArea {
                         anchors.fill: parent
                         onClicked: { edit.copy(); editor.state = "selection" }
                     }
                 }

                 Rectangle {
                     border.width: 1
                     border.color: "darkBlue"
                     color: "#ff7090FF"
                     width: 60
                     height: 16

                     Text { anchors.centerIn: parent; text: "Paste" }

                     MouseArea {
                         anchors.fill: parent
                         onClicked: { edit.paste(); edit.cursorPosition = edit.selectionEnd; editor.state = "" }
                     }
                 }

                 Rectangle {
                     border.width: 1
                     border.color: "darkBlue"
                     color: "#ff7090FF"
                     width: 60
                     height: 16

                     Text { anchors.centerIn: parent; text: "Deselect" }

                     MouseArea {
                         anchors.fill: parent
                         onClicked: {
                             edit.cursorPosition = edit.selectionEnd;
                             edit.select(edit.cursorPosition, edit.cursorPosition);
                             editor.state = ""
                         }
                     }
                 }
             }
         }
     }

     states: [
         State {
             name: "selection"
             PropertyChanges { target: startHandle; opacity: 1.0 }
             PropertyChanges { target: endHandle; opacity: 1.0 }
         },
         State {
             name: "menu"
             PropertyChanges { target: startHandle; opacity: 0.5 }
             PropertyChanges { target: endHandle; opacity: 0.5 }
             PropertyChanges { target: menu; opacity: 1.0 }
         }
     ]
 }
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