kwin/kcmkwin/kwindecoration/qml/Buttons.qml
David Edmundson 70d2fb2378 Avoid a crash on Kwin decoration KCM teardown
Summary:
As described in https://bugreports.qt.io/browse/QTBUG-57714  exposing a
QWidget as a context item to QtQuick can crash. Especially as the
engine's context property gets deleted whilst deleting the parent item.

This patch reworks the code so that the models are exposed to QML
directly rather than going through a QWidget.

CCBUG: 373628

Test Plan:
Pressing back whilst in the decoration KCM used to crash every time, now it doesn't.
I still have the buttons.

Reviewers: #plasma, graesslin

Reviewed By: #plasma, graesslin

Subscribers: graesslin, cfeck, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D4533
2017-02-10 14:01:09 +01:00

233 lines
10 KiB
QML

/*
* Copyright 2014 Martin Gräßlin <mgraesslin@kde.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License or (at your option) version 3 or any later version
* accepted by the membership of KDE e.V. (or its successor approved
* by the membership of KDE e.V.), which shall act as a proxy
* defined in Section 14 of version 3 of the license.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import QtQuick 2.3
import QtQuick.Controls 1.2
import QtQuick.Layouts 1.1
import org.kde.kwin.private.kdecoration 1.0 as KDecoration
import org.kde.kquickcontrolsaddons 2.0 as KQuickControlsAddons;
import org.kde.plasma.core 2.0 as PlasmaCore;
Item {
objectName: "buttonLayout"
Layout.preferredHeight: layout.height
KDecoration.Bridge {
id: bridgeItem
plugin: "org.kde.breeze"
}
KDecoration.Settings {
id: settingsItem
bridge: bridgeItem.bridge
}
Rectangle {
anchors.fill: parent
anchors.topMargin: units.gridUnit / 2
border.width: Math.ceil(units.gridUnit / 16.0)
color: SystemPalette.base;
border.color: highlightColor;
ColumnLayout {
id: layout
width: parent.width
height: titlebarRect.height + availableGrid.height + dragHint.height + 5*layout.spacing
Rectangle {
id: titlebarRect
height: buttonPreviewRow.height + units.smallSpacing
Layout.fillWidth: true
border.width: Math.ceil(units.gridUnit / 16.0)
border.color: highlightColor
color: SystemPalette.base;
RowLayout {
id: buttonPreviewRow
anchors.top: parent.top;
anchors.left: parent.left;
anchors.right: parent.right;
anchors.margins: units.smallSpacing / 2
height: Math.max(units.iconSizes.small, titlebar.implicitHeight) + units.smallSpacing/2
ButtonGroup {
id: leftButtonsView
anchors.left: parent.left;
height: buttonPreviewRow.height
model: leftButtons
key: "decoButtonLeft"
}
Item {
Layout.fillWidth: true
anchors.centerIn: parent
height: titlebar.implicitHeight
Label {
id: titlebar
anchors.centerIn: parent
font: titleFont
text: i18n("Titlebar")
}
}
ButtonGroup {
id: rightButtonsView
anchors.right: parent.right;
height: buttonPreviewRow.height
model: rightButtons
key: "decoButtonRight"
}
DropArea {
anchors.fill: parent
keys: [ "decoButtonAdd", "decoButtonRight", "decoButtonLeft" ]
onEntered: {
drag.accept();
}
onDropped: {
var view = undefined;
var left = drag.x - (leftButtonsView.x + leftButtonsView.width);
var right = drag.x - rightButtonsView.x;
if (Math.abs(left) <= Math.abs(right)) {
view = leftButtonsView;
} else {
view = rightButtonsView;
}
if (!view) {
return;
}
var point = mapToItem(view, drag.x, drag.y);
var index = view.indexAt(point.x, point.y);
if (index == -1 && (view.x + view.width <= drag.x)) {
index = view.count - 1;
}
if (drop.keys.indexOf("decoButtonAdd") != -1) {
view.model.add(index, drag.source.type);
} else if (drop.keys.indexOf("decoButtonLeft") != -1) {
if (view == leftButtonsView) {
// move in same view
if (index != drag.source.itemIndex) {
drag.source.buttonsModel.move(drag.source.itemIndex, index);
}
} else {
// move to right view
view.model.add(index, drag.source.type);
drag.source.buttonsModel.remove(drag.source.itemIndex);
}
} else if (drop.keys.indexOf("decoButtonRight") != -1) {
if (view == rightButtonsView) {
// move in same view
if (index != drag.source.itemIndex) {
drag.source.buttonsModel.move(drag.source.itemIndex, index);
}
} else {
// move to right view
view.model.add(index, drag.source.type);
drag.source.buttonsModel.remove(drag.source.itemIndex);
}
}
}
}
}
}
Text {
id: iCannotBelieveIDoThis
text: "gnarf"
visible: false
}
GridView {
id: availableGrid
Layout.fillWidth: true
model: availableButtons
interactive: false
cellWidth: iconLabel.implicitWidth
cellHeight: units.iconSizes.small + iCannotBelieveIDoThis.implicitHeight + 4*units.smallSpacing
height: Math.ceil(cellHeight * 2.5)
opacity: (leftButtonsView.dragging || rightButtonsView.dragging) ? 0.25 : 1.0
delegate: Item {
id: availableDelegate
width: availableGrid.cellWidth
height: availableGrid.cellHeight
KDecoration.Button {
id: availableButton
anchors.centerIn: Drag.active ? undefined : parent
bridge: bridgeItem.bridge
settings: settingsItem
type: model["button"]
width: units.iconSizes.small
height: units.iconSizes.small
Drag.keys: [ "decoButtonAdd" ]
Drag.active: dragArea.drag.active
}
Label {
id: iconLabel
text: model["display"]
horizontalAlignment: Text.AlignHCenter
anchors.bottom: parent.bottom
anchors.left: parent.left
anchors.right: parent.right
elide: Text.ElideRight
wrapMode: Text.NoWrap
}
MouseArea {
id: dragArea
anchors.fill: parent
drag.target: availableButton
cursorShape: Qt.PointingHandCursor
onReleased: {
if (availableButton.Drag.target) {
availableButton.Drag.drop();
} else {
availableButton.Drag.cancel();
}
}
}
}
}
Text {
id: dragHint
visible: !(leftButtonsView.dragging || rightButtonsView.dragging || availableGrid.dragging)
Layout.fillWidth: true
color: SystemPalette.text;
opacity: 0.66
horizontalAlignment: Text.AlignHCenter
verticalAlignment: Text.AlignTop
text: i18n("Drag buttons between here and the titlebar")
}
DropArea {
anchors.fill: availableGrid
keys: [ "decoButtonRemove" ]
onEntered: {
drag.accept();
}
onDropped: {
drag.source.buttonsModel.remove(drag.source.itemIndex);
}
ColumnLayout {
anchors.centerIn: parent
visible: leftButtonsView.dragging || rightButtonsView.dragging
Label {
text: i18n("Drop here to remove button")
font.bold: true
}
KQuickControlsAddons.QIconItem {
id: icon
width: 64
height: 64
icon: "list-remove"
Layout.alignment: Qt.AlignHCenter
}
Item {
Layout.fillHeight: true
}
}
}
}
}
}