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Make draganddrop example less confusing 

Use required properties, rather than context, use direct binding rather
than Binding elements, clarify that we're using the drag passed as
parameter, not the drag property of DropArea, move Icon to a different
file so that we get a distinct type for it. Give the icon a defined
color while it is being dragged.

Change-Id: I0e8b77abaedb9fc52660dfd4ddef1a4161f1323a
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
This commit is contained in:
Ulf Hermann 2019-11-15 15:06:44 +01:00
parent c6e63aa128
commit 8550dff55c
3 changed files with 109 additions and 44 deletions
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1
examples/quick/draganddrop/draganddrop.qrc
View File

@ -5,5 +5,6 @@
<file>tiles/DropTile.qml</file>
<file>tiles/tiles.qml</file>
<file>views/gridview.qml</file>
<file>views/Icon.qml</file>
</qresource>
</RCC>

96
examples/quick/draganddrop/views/Icon.qml Normal file
View File

@ -0,0 +1,96 @@
/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick 2.14
Rectangle {
id: icon
required property Item dragParent
property int visualIndex: 0
width: 72
height: 72
anchors {
horizontalCenter: parent.horizontalCenter
verticalCenter: parent.verticalCenter
}
radius: 3
Text {
anchors.centerIn: parent
color: "white"
text: parent.visualIndex
}
DragHandler {
id: dragHandler
}
Drag.active: dragHandler.active
Drag.source: icon
Drag.hotSpot.x: 36
Drag.hotSpot.y: 36
states: [
State {
when: dragHandler.active
ParentChange {
target: icon
parent: icon.dragParent
}
AnchorChanges {
target: icon
anchors.horizontalCenter: undefined
anchors.verticalCenter: undefined
}
}
]
}

56
examples/quick/draganddrop/views/gridview.qml
View File

@ -48,8 +48,9 @@
**
****************************************************************************/
import QtQuick 2.12
import QtQml.Models 2.1
import QtQml 2.14
import QtQuick 2.14
import QtQml.Models 2.14
GridView {
id: root
@ -94,54 +95,21 @@ GridView {
//! [1]
delegate: DropArea {
id: delegateRoot
required property color color;
width: 80; height: 80
onEntered: visualModel.items.move(drag.source.visualIndex, icon.visualIndex)
onEntered: function(drag) {
visualModel.items.move((drag.source as Icon).visualIndex, icon.visualIndex)
}
property int visualIndex: DelegateModel.itemsIndex
Binding { target: icon; property: "visualIndex"; value: visualIndex }
Rectangle {
Icon {
id: icon
property int visualIndex: 0
width: 72; height: 72
anchors {
horizontalCenter: parent.horizontalCenter;
verticalCenter: parent.verticalCenter
}
radius: 3
color: model.color
Text {
anchors.centerIn: parent
color: "white"
text: parent.visualIndex
}
DragHandler {
id: dragHandler
}
Drag.active: dragHandler.active
Drag.source: icon
Drag.hotSpot.x: 36
Drag.hotSpot.y: 36
states: [
State {
when: icon.Drag.active
ParentChange {
target: icon
parent: root
}
AnchorChanges {
target: icon
anchors.horizontalCenter: undefined
anchors.verticalCenter: undefined
}
}
]
dragParent: root
visualIndex: delegateRoot.visualIndex
color: delegateRoot.color
}
}
//! [1]