/usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Components/1.3/InputHandler.qml is in qml-module-ubuntu-components 1.3.1918+16.04.20160404-0ubuntu1.
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* Copyright 2014 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import QtQuick 2.4
import Ubuntu.Components 1.3
/*
This component is a unified text selection and scrolling handler for both
TextField and TextArea components.
*/
MultiPointTouchArea {
id: inputHandler
objectName: "input_handler"
// the root control
property Item main
// the input instance
property Item input
// the Flickable holding the input instance
property Flickable flickable
// item filling the visible text input area used to check handler visibility
property Item visibleArea: Item {
parent: flickable
anchors.fill: parent
}
// line size and spacing
property real lineSpacing: units.dp(3)
property real lineSize: input.font.pixelSize + lineSpacing
// input x/y distance from the frame
property point frameDistance: Qt.point(flickable.x, flickable.y)
// signal triggered when popup should be opened
signal pressAndHold(int pos, bool fromTouch)
signal tap(int pos)
property string oldText: ""
signal textModified()
function activateInput() {
if (!input.activeFocus) {
input.forceActiveFocus();
}
showInputPanel();
}
function showInputPanel() {
if (!UbuntuApplication.inputMethod.visible) {
UbuntuApplication.inputMethod.show();
}
textChanged = false;
}
// internal properties/functions
readonly property bool singleLine: input.hasOwnProperty("validator")
property var flickableList: new Array()
property bool textChanged: false
property var popover
property bool suppressReleaseEvent: false
property int pressedPosition: -1
// move properties
property int moveStarts: -1
property int moveEnds: -1
// set scroller to the first Flickable that scrolls the input
// this can be the internal Flickable if the full autosize is disabled
// or one of the input's parent Flickable
readonly property bool scrollingDisabled: main && main.hasOwnProperty("autoSize") ?
(main.autoSize && (main.maximumLineCount <= 0)) : false
onScrollingDisabledChanged: if (state == "") flickable.interactive = !scrollingDisabled
readonly property Flickable grandScroller: firstFlickableParent(main)
readonly property Flickable scroller: (scrollingDisabled && grandScroller) ? grandScroller : flickable
// ensures the text cursorRectangle is always in the internal Flickable's visible area
function ensureVisible(rect)
{
if (flickable.moving || flickable.flicking)
return;
if (flickable.contentX >= rect.x)
flickable.contentX = rect.x;
else if (flickable.contentX + flickable.width <= rect.x + rect.width)
flickable.contentX = rect.x + rect.width - flickable.width;
if (flickable.contentY >= rect.y)
flickable.contentY = rect.y;
else if (flickable.contentY + flickable.height <= rect.y + rect.height)
flickable.contentY = rect.y + rect.height - flickable.height;
}
// returns the cursor position from x,y pair
function unadulteratedCursorPosition(x, y) {
return singleLine ? input.positionAt(x, TextInput.CursorOnCharacter) : input.positionAt(x, y, TextInput.CursorOnCharacter);
}
// returns the cursor position taking frame into account
function cursorPosition(x, y) {
var frameSpacing = main.__styleInstance.frameSpacing;
var cursorPosition = unadulteratedCursorPosition(x, y);
if (cursorPosition == 0)
cursorPosition = unadulteratedCursorPosition(x + frameSpacing, y + frameSpacing);
if (cursorPosition == text.length)
cursorPosition = unadulteratedCursorPosition(x - frameSpacing, y - frameSpacing);
return cursorPosition
}
// returns the mouse position
function mousePosition(mouse) {
return cursorPosition(mouse.x, mouse.y);
}
// checks whether the position is in the selected text
function positionInSelection(pos) {
return (input.selectionStart !== input.selectionEnd)
&& (pos >= Math.min(input.selectionStart, input.selectionEnd))
&& (pos <= Math.max(input.selectionStart, input.selectionEnd));
}
// check whether the mouse is inside a selected text area
function mouseInSelection(mouse) {
var pos = mousePosition(mouse);
return positionInSelection(pos);
}
// selects text
function selectText(mouse) {
state = "select";
moveEnds = mousePosition(mouse);
if (moveStarts < 0) {
moveStarts = moveEnds;
}
input.select(moveStarts, moveEnds);
}
// returns the first Flickable parent of a given item
function firstFlickableParent(item) {
var p = item ? item.parent : null;
while (p && !p.hasOwnProperty("flicking")) {
p = p.parent;
}
return p;
}
// focuses the input if not yet focused, and shows the context menu
function openContextMenu(mouse, noAutoselect, fromTouch) {
var pos = mousePosition(mouse);
if (!main.focus || !mouseInSelection(mouse)) {
activateInput();
input.cursorPosition = pressedPosition = mousePosition(mouse);
if (!noAutoselect) {
input.selectWord();
}
}
// open context menu at the cursor position
inputHandler.pressAndHold(input.cursorPosition, fromTouch);
// if opened with left press (touch falls into this criteria as well), we need to set state to inactive
// so the mouse moves won't result in selected text loss/change
if (mouse.button === Qt.LeftButton) {
state = "inactive";
}
}
// disables interactive Flickable parents, stops at the first non-interactive flickable.
function toggleFlickablesInteractive(turnOn) {
var p;
if (!turnOn) {
// handle the scroller separately
p = firstFlickableParent(scroller)
while (p) {
if (p.interactive) {
flickableList.push(p);
p.interactive = false;
} else {
break;
}
p = firstFlickableParent(p);
}
} else {
while (flickableList.length > 0) {
p = flickableList.pop();
p.interactive = true;
}
}
}
// moves the specified position, called by the cursor handler
// positioner = "currentPosition/selectionStart/selectionEnd"
function positionCaret(positioner, x, y) {
if (positioner === "cursorPosition") {
input[positioner] = cursorPosition(x, y);
} else {
var pos = cursorPosition(x, y);
if (positioner === "selectionStart" && (pos < input.selectionEnd)) {
input.select(pos, input.selectionEnd);
} else if (positioner === "selectionEnd" && (pos > input.selectionStart)) {
input.select(input.selectionStart, pos);
}
}
}
// moves the cursor one page forward with or without positioning the cursor
function movePage(forward) {
var cx = input.cursorRectangle.x;
var cy = input.cursorRectangle.y;
if (forward) {
if (singleLine) {
cx += visibleArea.width;
} else {
cy += visibleArea.height;
}
} else {
if (singleLine) {
cx -= visibleArea.width;
} else {
cy -= visibleArea.height;
}
}
input.cursorPosition = cursorPosition(cx, cy);
}
Component.onCompleted: {
state = (main.focus) ? "" : "inactive";
// FIXME: Qt5.3 related! mouseEnabled is a 5.3 related property which has a positive
// default value. That value messes up teh current understanding (5.2) of the
// MultiPointTouchArea functioning. We need to set it to false until 5.3 will be the
// default supported Qt version, when we can have a clean property value assignment
if (inputHandler.hasOwnProperty("mouseEnabled")) {
inputHandler.mouseEnabled = false;
}
}
// states
states: [
// override default state to turn on the saved Flickable interactive mode
State {
name: ""
StateChangeScript {
// restore interactive for all Flickable parents
script: toggleFlickablesInteractive(true);
}
},
State {
name: "inactive"
// we do not disable scroller here as in case the internal scrolling
// is disabled (scrollingDisabled = true) the outer scroller (grandScroller)
// would be blocked as well, which we don't want to
PropertyChanges {
target: flickable
interactive: false
}
},
State {
name: "scrolling"
StateChangeScript {
script: {
// stop scrolling all the parents
toggleFlickablesInteractive(false);
// stop touch timers
touchPoint.reset();
}
}
},
State {
name: "select"
// during select state all the flickables are blocked (interactive = false)
// we can use scroller here as we need to disable the outer scroller too!
PropertyChanges {
target: scroller
interactive: false
}
StateChangeScript {
script: {
// turn off interactive for all parent flickables
toggleFlickablesInteractive(false);
if (!positionInSelection(pressedPosition)) {
input.cursorPosition = pressedPosition;
}
}
}
}
]
// brings the state back to default when the component looses focus
// and ensures input has active focus when component regains focus
Connections {
target: main
ignoreUnknownSignals: true
onFocusChanged: {
UbuntuApplication.inputMethod.commit()
state = (main.focus) ? "" : "inactive";
if (main.focus) {
input.forceActiveFocus()
}
}
}
// input specific signals
Connections {
target: input
onCursorRectangleChanged: ensureVisible(input.cursorRectangle)
onTextChanged: {
textChanged = true;
if (oldText != input.text) {
textModified()
oldText = text
}
}
// make sure we show the OSK
onActiveFocusChanged: showInputPanel()
}
// inner or outer Flickable controlling
Connections {
target: scroller
// turn scrolling state on
onFlickStarted: toggleScrollingState(true)
onMovementStarted: toggleScrollingState(true)
// reset to default state
onMovementEnded: toggleScrollingState(false)
function toggleScrollingState(turnOn) {
if (!main.focus) {
return;
}
inputHandler.state = (turnOn) ? "scrolling" : ""
}
}
// PageUp and PageDown handling
Keys.onPressed: {
if (event.key === Qt.Key_PageUp && event.modifiers === Qt.NoModifier) {
movePage(false);
} else if (event.key === Qt.Key_PageDown && event.modifiers === Qt.NoModifier) {
movePage(true);
}
}
// touch and mous handling
function handlePressed(event, touch) {
if (touch) {
// we do not have longTap or double tap, therefore we need to generate those
event.touch();
} else {
// consume event so it does not get forwarded to the input
event.accepted = true;
}
// remember pressed position as we need it when entering into selection state
pressedPosition = mousePosition(event);
}
function handleReleased(event, touch) {
if (touch) {
event.untouch();
}
if ((!main.focus && !main.activeFocusOnPress) || suppressReleaseEvent === true) {
suppressReleaseEvent = false;
return;
}
activateInput();
if (state === "" || touch) {
input.cursorPosition = mousePosition(event);
}
moveStarts = moveEnds = -1;
state = "";
// check if we get right-click from the frame or the area that has no text
if (event.button === Qt.RightButton) {
// open the popover
inputHandler.pressAndHold(input.cursorPosition, touch);
} else {
inputHandler.tap(input.cursorPosition);
}
}
function handleMove(event, touch ) {
// leave if not focus, not the left button or not in select state
if (!input.activeFocus || (!touch && event.button !== Qt.LeftButton) || !main.selectByMouse) {
return;
}
selectText(event);
}
function handleDblClick(event, touch) {
if (main.selectByMouse) {
openContextMenu(event, false, touch);
// turn selection state temporarily so the selection is not cleared on release
state = "selection";
suppressReleaseEvent = true;
}
}
// Mouse handling
Mouse.forwardTo: [main]
Mouse.onPressed: handlePressed(mouse, false)
Mouse.onReleased: handleReleased(mouse, false)
Mouse.onPositionChanged: handleMove(mouse, false)
Mouse.onDoubleClicked: handleDblClick(mouse, false)
// right button handling
MouseArea {
anchors.fill: parent
acceptedButtons: Qt.RightButton
// trigger pressAndHold
onReleased: openContextMenu(mouse, true, false)
cursorShape: Qt.IBeamCursor
}
Keys.onMenuPressed: inputHandler.pressAndHold(input.cursorPosition, false);
// touch handling
touchPoints: TouchPoint {
id: touchPoint
function touch() {
longTap.restart();
if (!doubleTap.running) {
doubleTap.restart();
} else if (doubleTap.tapCount > 0) {
doubleTap.running = false;
handleDblClick(touchPoint, true);
}
}
function untouch() {
longTap.running = false;
}
function reset() {
longTap.running = false;
doubleTap.running = false;
}
}
Timer {
id: longTap
// sync with QQuickMouseArea constant
interval: 800
onTriggered: {
// do not open context menu if the input is not focus
if (!main.focus) {
return;
}
// do not open context menu if this is scrolling
if (touchPoint.startY - touchPoint.y < -units.gu(2))
return;
openContextMenu(touchPoint, false, true);
suppressReleaseEvent = true;
}
}
property bool doubleTapInProgress: doubleTap.running
Timer {
id: doubleTap
property int tapCount: 0
interval: 400
onRunningChanged: {
tapCount = running;
}
}
onPressed: handlePressed(touchPoints[0], true)
onReleased: handleReleased(touchPoints[0], true)
property Item cursorPositionCursor: null
property Item selectionStartCursor: null
property Item selectionEndCursor: null
// cursors to use when text is selected
Connections {
target: input
onSelectedTextChanged: {
if (selectedText !== "") {
if (!selectionStartCursor) {
selectionStartCursor = input.cursorDelegate.createObject(
input, {
"positionProperty": "selectionStart",
"handler": inputHandler,
}
);
moveSelectionCursor(selectionStartCursor);
selectionEndCursor = input.cursorDelegate.createObject(
input, {
"positionProperty": "selectionEnd",
"handler": inputHandler,
}
);
moveSelectionCursor(selectionEndCursor);
}
} else {
if (selectionStartCursor) {
selectionStartCursor.destroy();
selectionStartCursor = null;
selectionEndCursor.destroy();
selectionEndCursor = null;
}
}
}
onSelectionStartChanged: moveSelectionCursor(selectionStartCursor, true);
onSelectionEndChanged: moveSelectionCursor(selectionEndCursor, true);
function moveSelectionCursor(cursor, updateProperty) {
if (!cursor) {
return;
}
// workaround for https://bugreports.qt-project.org/browse/QTBUG-38704
// selectedTextChanged signal is not emitted for TextEdit when selectByMouse is false
if (updateProperty && QuickUtils.className(input) === "QQuickTextEdit") {
input.selectedTextChanged();
}
var pos = input.positionToRectangle(input[cursor.positionProperty]);
cursor.x = pos.x;
cursor.y = pos.y;
cursor.height = pos.height;
ensureVisible(pos);
}
}
}
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