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libqt5raspi/debian/usr/local/qt5raspi-5.12.5/qml/QtQuick/Controls/SplitView.qml

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QML

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Quick Controls module of the Qt Toolkit.
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import QtQuick 2.2
import QtQuick.Controls 1.2
import QtQuick.Layouts 1.0
import QtQuick.Controls.Private 1.0 as Private
import QtQuick.Window 2.1
/*!
\qmltype SplitView
\inqmlmodule QtQuick.Controls
\since 5.1
\ingroup views
\ingroup controls
\brief Lays out items with a draggable splitter between each item.
\image splitview.png
SplitView is a control that lays out items horizontally or
vertically with a draggable splitter between each item.
There will always be one (and only one) item in the SplitView that has \l{Layout::fillWidth}{Layout.fillWidth}
set to \c true (or \l{Layout::fillHeight}{Layout.fillHeight}, if orientation is Qt.Vertical). This means that the
item will get all leftover space when other items have been laid out.
By default, the last visible child of the SplitView will have this set, but
it can be changed by explicitly setting fillWidth to \c true on another item.
As the fillWidth item will automatically be resized to fit the extra space, explicit assignments
to its width and height properties will be ignored (but \l{Layout::minimumWidth}{Layout.minimumWidth} and
\l{Layout::maximumWidth}{Layout.maximumWidth} will still be respected).
The initial sizes of other items should be set via their width and height properties.
Any binding assignment to an item's width or height will be broken as soon as the user
drags that item's splitter handle.
A handle can belong to the item either on the left or top side, or on the right or bottom side:
\list
\li If the fillWidth item is to the right: the handle belongs to the left item.
\li if the fillWidth item is on the left: the handle belongs to the right item.
\endlist
This will again control which item gets resized when the user drags a handle,
and which handle gets hidden when an item is told to hide.
SplitView supports setting attached Layout properties on child items, which
means that you can set the following attached properties for each child:
\list
\li \l{Layout::minimumWidth}{Layout.minimumWidth}
\li \l{Layout::minimumHeight}{Layout.minimumHeight}
\li \l{Layout::maximumWidth}{Layout.maximumWidth}
\li \l{Layout::maximumHeight}{Layout.maximumHeight}
\li \l{Layout::fillWidth}{Layout.fillWidth} (\c true for only one child)
\li \l{Layout::fillHeight}{Layout.fillHeight} (\c true for only one child)
\endlist
\note import QtQuick.Layouts 1.0 in your QML file in order to use the Layout
attached properties inside SplitView.
Example:
To create a SplitView with three items, and let the center item get superfluous space, one
could do the following:
\qml
SplitView {
anchors.fill: parent
orientation: Qt.Horizontal
Rectangle {
width: 200
Layout.maximumWidth: 400
color: "lightblue"
Text {
text: "View 1"
anchors.centerIn: parent
}
}
Rectangle {
id: centerItem
Layout.minimumWidth: 50
Layout.fillWidth: true
color: "lightgray"
Text {
text: "View 2"
anchors.centerIn: parent
}
}
Rectangle {
width: 200
color: "lightgreen"
Text {
text: "View 3"
anchors.centerIn: parent
}
}
}
\endqml
*/
Item {
id: root
/*!
\qmlproperty enumeration SplitView::orientation
This property holds the orientation of the SplitView.
The value can be either \c Qt.Horizontal or \c Qt.Vertical.
The default value is \c Qt.Horizontal.
*/
property int orientation: Qt.Horizontal
/*!
This property holds the delegate that will be instantiated between each
child item. Inside the delegate the following properties are available:
\table
\row \li readonly property bool styleData.index \li Specifies the index of the splitter handle. The handle
between the first and the second item will get index 0,
the next handle index 1 etc.
\row \li readonly property bool styleData.hovered \li The handle is being hovered.
\row \li readonly property bool styleData.pressed \li The handle is being pressed.
\row \li readonly property bool styleData.resizing \li The handle is being dragged.
\endtable
*/
property Component handleDelegate: Rectangle {
width: 1
height: 1
color: Qt.darker(pal.window, 1.5)
}
/*!
This propery is \c true when the user is resizing any of the items by
dragging on the splitter handles.
*/
property bool resizing: false
/*! \internal */
default property alias __contents: contents.data
/*! \internal */
property alias __items: splitterItems.children
/*! \internal */
property alias __handles: splitterHandles.children
clip: true
Component.onCompleted: d.init()
onWidthChanged: d.updateLayout()
onHeightChanged: d.updateLayout()
onOrientationChanged: d.changeOrientation()
/*! \qmlmethod void SplitView::addItem(Item item)
Add an item to the end of the view.
\since QtQuick.Controls 1.3 */
function addItem(item) {
d.updateLayoutGuard = true
d.addItem_impl(item)
d.calculateImplicitSize()
d.updateLayoutGuard = false
d.updateFillIndex()
}
/*! \qmlmethod void SplitView::removeItem(Item item)
Remove \a item from the view.
\since QtQuick.Controls 1.4 */
function removeItem(item) {
d.updateLayoutGuard = true
var result = d.removeItem_impl(item)
if (result !== null) {
d.calculateImplicitSize()
d.updateLayoutGuard = false
d.updateFillIndex()
}
else {
d.updateLayoutGuard = false
}
}
SystemPalette { id: pal }
QtObject {
id: d
readonly property string leftMargin: horizontal ? "leftMargin" : "topMargin"
readonly property string topMargin: horizontal ? "topMargin" : "leftMargin"
readonly property string rightMargin: horizontal ? "rightMargin" : "bottomMargin"
property bool horizontal: orientation == Qt.Horizontal
readonly property string minimum: horizontal ? "minimumWidth" : "minimumHeight"
readonly property string maximum: horizontal ? "maximumWidth" : "maximumHeight"
readonly property string otherMinimum: horizontal ? "minimumHeight" : "minimumWidth"
readonly property string otherMaximum: horizontal ? "maximumHeight" : "maximumWidth"
readonly property string offset: horizontal ? "x" : "y"
readonly property string otherOffset: horizontal ? "y" : "x"
readonly property string size: horizontal ? "width" : "height"
readonly property string otherSize: horizontal ? "height" : "width"
readonly property string implicitSize: horizontal ? "implicitWidth" : "implicitHeight"
readonly property string implicitOtherSize: horizontal ? "implicitHeight" : "implicitWidth"
property int fillIndex: -1
property bool updateLayoutGuard: true
function extraMarginSize(item, other) {
if (typeof(other) === 'undefined')
other = false;
if (other === horizontal)
// vertical
return item.Layout.topMargin + item.Layout.bottomMargin
return item.Layout.leftMargin + item.Layout.rightMargin
}
function addItem_impl(item)
{
// temporarily set fillIndex to new item
fillIndex = __items.length
if (splitterItems.children.length > 0)
handleLoader.createObject(splitterHandles, {"__handleIndex":splitterItems.children.length - 1})
item.parent = splitterItems
d.initItemConnections(item)
}
function initItemConnections(item)
{
// should match disconnections in terminateItemConnections
item.widthChanged.connect(d.updateLayout)
item.heightChanged.connect(d.updateLayout)
item.Layout.maximumWidthChanged.connect(d.updateLayout)
item.Layout.minimumWidthChanged.connect(d.updateLayout)
item.Layout.maximumHeightChanged.connect(d.updateLayout)
item.Layout.minimumHeightChanged.connect(d.updateLayout)
item.Layout.leftMarginChanged.connect(d.updateLayout)
item.Layout.topMarginChanged.connect(d.updateLayout)
item.Layout.rightMarginChanged.connect(d.updateLayout)
item.Layout.bottomMarginChanged.connect(d.updateLayout)
item.visibleChanged.connect(d.updateFillIndex)
item.Layout.fillWidthChanged.connect(d.updateFillIndex)
item.Layout.fillHeightChanged.connect(d.updateFillIndex)
}
function terminateItemConnections(item)
{
// should match connections in initItemConnections
item.widthChanged.disconnect(d.updateLayout)
item.heightChanged.disconnect(d.updateLayout)
item.Layout.maximumWidthChanged.disconnect(d.updateLayout)
item.Layout.minimumWidthChanged.disconnect(d.updateLayout)
item.Layout.maximumHeightChanged.disconnect(d.updateLayout)
item.Layout.minimumHeightChanged.disconnect(d.updateLayout)
item.visibleChanged.disconnect(d.updateFillIndex)
item.Layout.fillWidthChanged.disconnect(d.updateFillIndex)
item.Layout.fillHeightChanged.disconnect(d.updateFillIndex)
}
function removeItem_impl(item)
{
var pos = itemPos(item)
// Check pos range
if (pos < 0 || pos >= __items.length)
return null
// Temporary unset the fillIndex
fillIndex = __items.length - 1
// Remove the handle at the left/right of the item that
// is going to be removed
var handlePos = -1
var hasPrevious = pos > 0
var hasNext = (pos + 1) < __items.length
if (hasPrevious)
handlePos = pos-1
else if (hasNext)
handlePos = pos
if (handlePos >= 0) {
var handle = __handles[handlePos]
handle.visible = false
handle.parent = null
handle.destroy()
for (var i = handlePos; i < __handles.length; ++i)
__handles[i].__handleIndex = i
}
// Remove the item.
// Disconnect the item to be removed
terminateItemConnections(item)
item.parent = null
return item
}
function itemPos(item)
{
for (var i = 0; i < __items.length; ++i)
if (item === __items[i])
return i
return -1
}
function init()
{
for (var i=0; i<__contents.length; ++i) {
var item = __contents[i];
if (!item.hasOwnProperty("x"))
continue
addItem_impl(item)
i-- // item was removed from list
}
d.calculateImplicitSize()
d.updateLayoutGuard = false
d.updateFillIndex()
}
function updateFillIndex()
{
if (lastItem.visible !== root.visible)
return
var policy = (root.orientation === Qt.Horizontal) ? "fillWidth" : "fillHeight"
for (var i=0; i<__items.length-1; ++i) {
if (__items[i].Layout[policy] === true)
break;
}
d.fillIndex = i
d.updateLayout()
}
function changeOrientation()
{
if (__items.length == 0)
return;
d.updateLayoutGuard = true
// Swap width/height for items and handles:
for (var i=0; i<__items.length; ++i) {
var item = __items[i]
var tmp = item.x
item.x = item.y
item.y = tmp
tmp = item.width
item.width = item.height
item.height = tmp
var handle = __handles[i]
if (handle) {
tmp = handle.x
handle.x = handle.y
handle.y = handle.x
tmp = handle.width
handle.width = handle.height
handle.height = tmp
}
}
// Change d.horizontal explicit, since the binding will change too late:
d.horizontal = orientation == Qt.Horizontal
d.updateLayoutGuard = false
d.updateFillIndex()
}
function calculateImplicitSize()
{
var implicitSize = 0
var implicitOtherSize = 0
for (var i=0; i<__items.length; ++i) {
var item = __items[i];
implicitSize += clampedMinMax(item[d.size], item.Layout[minimum], item.Layout[maximum]) + extraMarginSize(item)
var os = clampedMinMax(item[otherSize], item.Layout[otherMinimum], item.Layout[otherMaximum]) + extraMarginSize(item, true)
implicitOtherSize = Math.max(implicitOtherSize, os)
var handle = __handles[i]
if (handle)
implicitSize += handle[d.size] //### Can handles have margins??
}
root[d.implicitSize] = implicitSize
root[d.implicitOtherSize] = implicitOtherSize
}
function clampedMinMax(value, minimum, maximum)
{
if (value < minimum)
value = minimum
if (value > maximum)
value = maximum
return value
}
function accumulatedSize(firstIndex, lastIndex, includeFillItemMinimum)
{
// Go through items and handles, and
// calculate their accummulated width.
var w = 0
for (var i=firstIndex; i<lastIndex; ++i) {
var item = __items[i]
if (item.visible || i == d.fillIndex) {
if (i !== d.fillIndex)
w += item[d.size] + extraMarginSize(item)
else if (includeFillItemMinimum && item.Layout[minimum] !== undefined)
w += item.Layout[minimum] + extraMarginSize(item)
}
var handle = __handles[i]
if (handle && handle.visible)
w += handle[d.size]
}
return w
}
function updateLayout()
{
// This function will reposition both handles and
// items according to the their width/height:
if (__items.length === 0)
return;
if (!lastItem.visible)
return;
if (d.updateLayoutGuard === true)
return
d.updateLayoutGuard = true
// Ensure all items within their min/max:
for (var i=0; i<__items.length; ++i) {
if (i !== d.fillIndex) {
var item = __items[i];
var clampedSize = clampedMinMax(item[d.size], item.Layout[d.minimum], item.Layout[d.maximum])
if (clampedSize != item[d.size])
item[d.size] = clampedSize
}
}
// Set size of fillItem to remaining available space.
// Special case: If SplitView size is zero, we leave fillItem with the size
// it already got, and assume that SplitView ends up with implicit size as size:
if (root[d.size] != 0) {
var fillItem = __items[fillIndex]
var superfluous = root[d.size] - d.accumulatedSize(0, __items.length, false)
fillItem[d.size] = clampedMinMax(superfluous - extraMarginSize(fillItem), fillItem.Layout[minimum], fillItem.Layout[maximum]);
}
// Position items and handles according to their width:
var lastVisibleItem, lastVisibleHandle, handle
var pos = 0;
for (i=0; i<__items.length; ++i) {
// Position item to the right of the previous visible handle:
item = __items[i];
if (item.visible || i == d.fillIndex) {
pos += item.Layout[leftMargin]
item[d.offset] = pos
item[d.otherOffset] = item.Layout[topMargin]
item[d.otherSize] = clampedMinMax(root[otherSize], item.Layout[otherMinimum], item.Layout[otherMaximum]) - extraMarginSize(item, true)
lastVisibleItem = item
pos += Math.max(0, item[d.size]) + item.Layout[rightMargin]
}
handle = __handles[i]
if (handle && handle.visible) {
handle[d.offset] = pos
handle[d.otherOffset] = 0 //### can handles have margins?
handle[d.otherSize] = root[d.otherSize]
lastVisibleHandle = handle
pos += handle[d.size]
}
}
d.updateLayoutGuard = false
}
}
Component {
id: handleLoader
Loader {
id: itemHandle
property int __handleIndex: -1
property QtObject styleData: QtObject {
readonly property int index: __handleIndex
readonly property alias hovered: mouseArea.containsMouse
readonly property alias pressed: mouseArea.pressed
readonly property bool resizing: mouseArea.drag.active
onResizingChanged: root.resizing = resizing
}
property bool resizeLeftItem: (d.fillIndex > __handleIndex)
visible: __items[__handleIndex + (resizeLeftItem ? 0 : 1)].visible
sourceComponent: handleDelegate
onWidthChanged: d.updateLayout()
onHeightChanged: d.updateLayout()
onXChanged: moveHandle()
onYChanged: moveHandle()
MouseArea {
id: mouseArea
anchors.fill: parent
property real defaultMargin: Private.Settings.hasTouchScreen ? Screen.pixelDensity * 3.5 : 2
anchors.leftMargin: (parent.width <= 1) ? -defaultMargin : 0
anchors.rightMargin: (parent.width <= 1) ? -defaultMargin : 0
anchors.topMargin: (parent.height <= 1) ? -defaultMargin : 0
anchors.bottomMargin: (parent.height <= 1) ? -defaultMargin : 0
hoverEnabled: Private.Settings.hoverEnabled
drag.threshold: 0
drag.target: parent
drag.axis: root.orientation === Qt.Horizontal ? Drag.XAxis : Drag.YAxis
cursorShape: root.orientation === Qt.Horizontal ? Qt.SplitHCursor : Qt.SplitVCursor
}
function moveHandle() {
// Moving the handle means resizing an item. Which one,
// left or right, depends on where the fillItem is.
// 'updateLayout' will be overridden in case new width violates max/min.
// 'updateLayout' will be triggered when an item changes width.
if (d.updateLayoutGuard)
return
var leftHandle, leftItem, rightItem, rightHandle
var leftEdge, rightEdge, newWidth, leftStopX, rightStopX
var i
if (resizeLeftItem) {
// Ensure that the handle is not crossing other handles. So
// find the first visible handle to the left to determine the left edge:
leftEdge = 0
for (i=__handleIndex-1; i>=0; --i) {
leftHandle = __handles[i]
if (leftHandle.visible) {
leftEdge = leftHandle[d.offset] + leftHandle[d.size]
break;
}
}
// Ensure: leftStopX >= itemHandle[d.offset] >= rightStopX
var min = d.accumulatedSize(__handleIndex+1, __items.length, true)
rightStopX = root[d.size] - min - itemHandle[d.size]
leftStopX = Math.max(leftEdge, itemHandle[d.offset])
itemHandle[d.offset] = Math.min(rightStopX, Math.max(leftStopX, itemHandle[d.offset]))
newWidth = itemHandle[d.offset] - leftEdge
leftItem = __items[__handleIndex]
// The next line will trigger 'updateLayout':
leftItem[d.size] = newWidth
} else {
// Resize item to the right.
// Ensure that the handle is not crossing other handles. So
// find the first visible handle to the right to determine the right edge:
rightEdge = root[d.size]
for (i=__handleIndex+1; i<__handles.length; ++i) {
rightHandle = __handles[i]
if (rightHandle.visible) {
rightEdge = rightHandle[d.offset]
break;
}
}
// Ensure: leftStopX <= itemHandle[d.offset] <= rightStopX
min = d.accumulatedSize(0, __handleIndex+1, true)
leftStopX = min - itemHandle[d.size]
rightStopX = Math.min((rightEdge - itemHandle[d.size]), itemHandle[d.offset])
itemHandle[d.offset] = Math.max(leftStopX, Math.min(itemHandle[d.offset], rightStopX))
newWidth = rightEdge - (itemHandle[d.offset] + itemHandle[d.size])
rightItem = __items[__handleIndex+1]
// The next line will trigger 'updateLayout':
rightItem[d.size] = newWidth
}
}
}
}
Item {
id: contents
visible: false
anchors.fill: parent
}
Item {
id: splitterItems
anchors.fill: parent
}
Item {
id: splitterHandles
anchors.fill: parent
}
Item {
id: lastItem
onVisibleChanged: d.updateFillIndex()
}
Component.onDestruction: {
for (var i=0; i<splitterItems.children.length; ++i) {
var item = splitterItems.children[i];
d.terminateItemConnections(item)
}
}
}