阻抗弹窗
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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the Qt Quick Controls module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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import QtQuick 2.2
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import QtQuick.Controls 1.2
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import QtQuick.Controls.Private 1.0
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Item {
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id: content
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property Component menuItemDelegate
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property Component scrollIndicatorStyle
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property Component scrollerStyle
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property var itemsModel
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property int minWidth: 100
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property real maxHeight: 800
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readonly property bool mousePressed: hoverArea.pressed
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signal triggered(var item)
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function menuItemAt(index) {
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list.currentIndex = index
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return list.currentItem
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}
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width: Math.max(list.contentWidth, minWidth)
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height: Math.min(list.contentHeight, fittedMaxHeight)
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readonly property int currentIndex: __menu.__currentIndex
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property Item currentItem: null
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property int itemHeight: 23
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Component.onCompleted: {
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var children = list.contentItem.children
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for (var i = 0; i < list.count; i++) {
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var child = children[i]
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if (child.visible && child.styleData.type === MenuItemType.Item) {
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itemHeight = children[i].height
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break
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}
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}
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}
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readonly property int fittingItems: Math.floor((maxHeight - downScroller.height) / itemHeight)
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readonly property real fittedMaxHeight: itemHeight * fittingItems + downScroller.height
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readonly property bool shouldUseScrollers: scrollView.style === emptyScrollerStyle && itemsModel.length > fittingItems
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readonly property real upScrollerHeight: upScroller.visible ? upScroller.height : 0
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readonly property real downScrollerHeight: downScroller.visible ? downScroller.height : 0
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property var oldMousePos: undefined
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property var openedSubmenu: null
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function updateCurrentItem(mouse) {
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var pos = mapToItem(list.contentItem, mouse.x, mouse.y)
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var dx = 0
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var dy = 0
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var dist = 0
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if (openedSubmenu && oldMousePos !== undefined) {
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dx = mouse.x - oldMousePos.x
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dy = mouse.y - oldMousePos.y
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dist = Math.sqrt(dx * dx + dy * dy)
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}
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oldMousePos = mouse
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if (openedSubmenu && dist > 5) {
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var menuRect = __menu.__popupGeometry
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var submenuRect = openedSubmenu.__popupGeometry
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var angle = Math.atan2(dy, dx)
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var ds = 0
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if (submenuRect.x > menuRect.x) {
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ds = menuRect.width - oldMousePos.x
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} else {
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angle = Math.PI - angle
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ds = oldMousePos.x
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}
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var above = submenuRect.y - menuRect.y - oldMousePos.y
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var below = submenuRect.height - above
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var minAngle = Math.atan2(above, ds)
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var maxAngle = Math.atan2(below, ds)
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// This tests that the current mouse position is in
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// the triangle defined by the previous mouse position
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// and the submenu's top-left and bottom-left corners.
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if (minAngle < angle && angle < maxAngle) {
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sloppyTimer.start()
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return
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}
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}
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if (!currentItem || !currentItem.contains(Qt.point(pos.x - currentItem.x, pos.y - currentItem.y))) {
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if (currentItem && !hoverArea.pressed
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&& currentItem.styleData.type === MenuItemType.Menu) {
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currentItem.__closeSubMenu()
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openedSubmenu = null
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}
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currentItem = list.itemAt(pos.x, pos.y)
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if (currentItem) {
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__menu.__currentIndex = currentItem.__menuItemIndex
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if (currentItem.styleData.type === MenuItemType.Menu) {
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showCurrentItemSubMenu(false)
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}
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} else {
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__menu.__currentIndex = -1
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}
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}
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}
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function showCurrentItemSubMenu(immediately) {
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if (!currentItem.__menuItem.__popupVisible) {
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currentItem.__showSubMenu(immediately)
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openedSubmenu = currentItem.__menuItem
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}
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}
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Timer {
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id: sloppyTimer
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interval: 1000
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// Stop timer as soon as we hover one of the submenu items
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property int currentIndex: openedSubmenu ? openedSubmenu.__currentIndex : -1
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onCurrentIndexChanged: if (currentIndex !== -1) stop()
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onTriggered: {
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if (openedSubmenu && openedSubmenu.__currentIndex === -1)
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updateCurrentItem(oldMousePos)
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}
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}
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Component {
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id: emptyScrollerStyle
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Style {
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padding { left: 0; right: 0; top: 0; bottom: 0 }
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property bool scrollToClickedPosition: false
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property Component frame: Item { visible: false }
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property Component corner: Item { visible: false }
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property Component __scrollbar: Item { visible: false }
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}
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}
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ScrollView {
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id: scrollView
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anchors {
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fill: parent
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topMargin: upScrollerHeight
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bottomMargin: downScrollerHeight
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}
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style: scrollerStyle || emptyScrollerStyle
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__wheelAreaScrollSpeed: itemHeight
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ListView {
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id: list
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model: itemsModel
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delegate: menuItemDelegate
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snapMode: ListView.SnapToItem
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boundsBehavior: Flickable.StopAtBounds
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highlightFollowsCurrentItem: true
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highlightMoveDuration: 0
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}
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}
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MouseArea {
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id: hoverArea
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anchors.left: scrollView.left
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width: scrollView.width - scrollView.__verticalScrollBar.width
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height: parent.height
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hoverEnabled: Settings.hoverEnabled
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acceptedButtons: Qt.AllButtons
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onPositionChanged: updateCurrentItem({ "x": mouse.x, "y": mouse.y })
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onPressed: updateCurrentItem({ "x": mouse.x, "y": mouse.y })
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onReleased: {
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if (currentItem && currentItem.__menuItem.enabled) {
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if (currentItem.styleData.type === MenuItemType.Menu) {
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showCurrentItemSubMenu(true)
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} else {
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content.triggered(currentItem)
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}
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}
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}
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onExited: {
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if (currentItem && !currentItem.__menuItem.__popupVisible) {
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currentItem = null
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__menu.__currentIndex = -1
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}
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}
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MenuContentScroller {
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id: upScroller
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direction: Qt.UpArrow
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visible: shouldUseScrollers && !list.atYBeginning
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function scrollABit() { list.contentY -= itemHeight }
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}
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MenuContentScroller {
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id: downScroller
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direction: Qt.DownArrow
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visible: shouldUseScrollers && !list.atYEnd
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function scrollABit() { list.contentY += itemHeight }
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}
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}
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Timer {
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interval: 1
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running: true
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repeat: false
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onTriggered: list.positionViewAtIndex(currentIndex, !scrollView.__style
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? ListView.Center : ListView.Beginning)
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}
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Binding {
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target: scrollView.__verticalScrollBar
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property: "singleStep"
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value: itemHeight
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}
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}
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