feat(StatusImageCropPanel): Add image crop editor panel component
New QML component StatusQ.Components.StatusImageCropPanel that extends on StatusImageCrop with simper interface and extra features Features: - Minimizes drawing with Canvas to the crop window - Adds user interactions: pan, zoom - Zoom slider for zooming, beside the mouse scroll action - Optional checker pattern for background for the user to have a visual feedback on the transparent areas or image margins fixes: #5401 updates: #5118
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Stefan
Stefan Dunca
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import QtQuick 2.14
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import QtQuick.Layouts 1.14
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import StatusQ.Core 0.1
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import StatusQ.Controls 0.1
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/*!
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\qmltype StatusImageCropPanel
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\inherits Item
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\inqmlmodule StatusQ.Components
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\since StatusQ.Components 0.1
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\brief Draw a crop-window onto an image and allows manipulating the position of the crop-window. Inherits \l{https://doc.qt.io/qt-5/qml-qtquick-item.html}{Item}.
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Adds mouse pan and zoom functionality on top of StatusImageCrop functionality. Also adds small
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practical features and optimizes drawing by minimizing StatusImageCrop area
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\sa StatusImageCrop for more details
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Example of how to use it:
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\qml
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StatusImageCropPanel {
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width: 400
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height: 200
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source: "qrc:/demoapp/data/logo-test-image.png"
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windowStyle: StatusImageCrop.WindowStyle.Rectangular
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Component.onCompleted: setCropRect(Qt.rect(10, 0, sourceSize.width - 20, sourceSize.height))
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}
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\endqml
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For a list of components available see StatusQ.
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*/
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Item {
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id: root
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implicitWidth: mainLayout.implicitWidth
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implicitHeight: mainLayout.implicitHeight
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/*!
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\qmlproperty real StatusImageCrop::aspectRatio
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Initial aspect-ratio of the crop-window
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*/
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property real aspectRatio: 1
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/*!
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\qmlproperty bool StatusImageCrop::interactive
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If true allows user to interact with the image. Set to false for previewing existing crop-data
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*/
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property bool interactive: true
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/*!
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\qmlproperty bool StatusImageCrop::margins
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Space to keep around the control borders and crop area
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*/
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property int margins: 10
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/*!
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\qmlproperty url StatusImageCropPanel::source
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\sa StatusImageCrop::source
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*/
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/*required*/ property alias source: cropEditor.source
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/*!
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\qmlproperty WindowStyle StatusImageCropPanel::windowStyle
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\sa StatusImageCrop::windowStyle
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*/
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property alias windowStyle: cropEditor.windowStyle
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/*!
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\qmlproperty int StatusImageCropPanel::radius
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\sa StatusImageCrop::radius
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*/
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property alias radius: cropEditor.radius
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/*!
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\qmlproperty color StatusImageCropPanel::wallColor
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\sa StatusImageCrop::wallColor
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*/
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property alias wallColor: cropEditor.wallColor
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/*!
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\qmlproperty real StatusImageCropPanel::wallTransparency
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\sa StatusImageCrop::wallTransparency
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*/
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property alias wallTransparency: cropEditor.wallTransparency
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/*!
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\qmlproperty rect StatusImageCropPanel::cropRect
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\sa StatusImageCrop::cropRect
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*/
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property alias cropRect: cropEditor.cropRect
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/*!
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\qmlproperty rect StatusImageCropPanel::cropRect
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\sa StatusImageCrop::cropRect
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*/
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readonly property alias cropWindow: cropEditor.cropWindow
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/*!
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\qmlproperty real StatusImageCrop::scrollZoomFactor
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How fast is image scaled (zoomed) when using mouse scroll
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*/
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property real scrollZoomFactor: 0.5
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/*!
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\qmlproperty bool StatusImageCropPanel::enableCheckers
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Shows helper guiding checkers pattern where image is not covering
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*/
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property bool enableCheckers: root.interactive
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/*!
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\qmlproperty size StatusImageCropPanel::sourceSize
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\sa StatusImageCrop::sourceSize
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*/
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property alias sourceSize: cropEditor.sourceSize
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/*
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\qmlmethod StatusImageCropPanel::setCropRect(rect)
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\sa StatusImageCrop::cropRect
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*/
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function setCropRect(newRect) {
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cropEditor.setCropRect(newRect)
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aspectRatio = cropEditor.aspectRatio
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}
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QtObject {
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id: d
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function updateAspectRatio(newAR) {
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// Keep width and adjust height
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const eW = cropEditor.cropRect.width
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const w = (eW <= 0) ? cropEditor.sourceSize.width : eW
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const h = w/newAR
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const c = (eW <= 0)
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? Qt.point(cropEditor.sourceSize.width/2, cropEditor.sourceSize.height/2)
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: Qt.point(cropEditor.cropRect.x + w/2, cropEditor.cropRect.y + cropEditor.cropRect.height/2)
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const nR = Qt.rect(c.x - w/2, c.y-h/2, w, h)
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cropEditor.setCropRect(nR)
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}
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}
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Component.onCompleted: d.updateAspectRatio(root.aspectRatio)
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onAspectRatioChanged: d.updateAspectRatio(root.aspectRatio)
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onSourceSizeChanged: d.updateAspectRatio(root.aspectRatio)
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ColumnLayout {
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id: mainLayout
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anchors.fill: parent
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Item {
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id: cropSpaceItem
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Layout.fillWidth: true
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Layout.fillHeight: true
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clip: true
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Rectangle {
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id: leftOverlay
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anchors.left: parent.left
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anchors.top: parent.top
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anchors.right: cropEditor.left
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anchors.bottom: parent.bottom
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color: wallColor
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opacity: wallTransparency
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z: cropEditor.z + 1
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}
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Rectangle {
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id: topOverlay
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anchors.left: leftOverlay.right
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anchors.top: parent.top
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anchors.right: rightOverlay.left
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anchors.bottom: cropEditor.top
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color: wallColor
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opacity: wallTransparency
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z: cropEditor.z + 1
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}
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StatusImageCrop {
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id: cropEditor
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anchors.centerIn: parent
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width: aspectRatio < cropSpaceItem.width/cropSpaceItem.height ? cropSpaceItem.height * aspectRatio : cropSpaceItem.width - root.margins * 2
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height: aspectRatio < cropSpaceItem.width/cropSpaceItem.height ? cropSpaceItem.height - root.margins * 2 : cropSpaceItem.width / aspectRatio
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}
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Rectangle {
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id: rightOverlay
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anchors.left: cropEditor.right
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anchors.top: parent.top
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anchors.right: parent.right
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anchors.bottom: parent.bottom
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color: wallColor
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opacity: wallTransparency
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z: cropEditor.z + 1
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}
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Rectangle {
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id: bottomOverlay
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anchors.left: leftOverlay.right
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anchors.top: cropEditor.bottom
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anchors.right: rightOverlay.left
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anchors.bottom: parent.bottom
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color: wallColor
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opacity: wallTransparency
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z: cropEditor.z + 1
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}
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// Checkers
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Canvas {
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visible: root.enableCheckers
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anchors.fill: parent
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onPaint: {
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var ctx = getContext("2d")
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for(let xI = 0; xI < Math.ceil(width/10); xI++) {
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for(let yI = 0; yI < Math.ceil(height/10); yI++) {
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ctx.fillStyle = (xI % 2) === (yI % 2) ? "#FFFFFE" : "#DBDBDB"
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ctx.fillRect(xI * 10, yI * 10, 10, 10)
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}
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}
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}
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z: cropEditor.z - 1
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}
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// Drag and zoom
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MouseArea {
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anchors.fill: parent
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enabled: root.interactive
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property var lastDragPoint: null
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onReleased: lastDragPoint = null
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onMouseXChanged: updateDrag(Qt.point(mouse.x, mouse.y))
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onMouseYChanged: updateDrag(Qt.point(mouse.x, mouse.y))
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onWheel: {
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const delta = wheel.angleDelta.y / 120
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cropEditor.setCropRect(cropEditor.getZoomRect(cropEditor.zoomScale + delta * root.scrollZoomFactor))
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}
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function moveRect(r /*rect*/, delta /*real*/) {
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return Qt.rect(r.x + delta.x, r.y + delta.y, r.width, r.height)
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}
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function scaleSize(sz /*size*/, s /*size*/) {
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return Qt.point(sz.width * s, sz.height * s)
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}
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function updateDrag(p) {
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let delta = (lastDragPoint ? Qt.size(lastDragPoint.x - p.x, lastDragPoint.y - p.y) : Qt.size(0, 0))
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delta = scaleSize(delta, 1/cropEditor.scrToImgScale)
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cropEditor.setCropRect(moveRect(cropEditor.cropRect, delta))
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lastDragPoint = p
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}
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}
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}
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RowLayout {
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visible: root.interactive
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StatusIcon {
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icon: "remove-circle"
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Layout.preferredWidth: 20
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Layout.preferredHeight: 20
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}
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StatusSlider {
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Layout.fillWidth: true
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Layout.preferredHeight: 5
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Layout.topMargin: 20
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Layout.bottomMargin: 25
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Layout.alignment: Qt.AlignVCenter
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enabled: root.interactive
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from: 1
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value: cropEditor.zoomScale
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live: false
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onMoved: cropEditor.setCropRect(cropEditor.getZoomRect(valueAt(visualPosition)))
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to: 10
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}
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StatusIcon {
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icon: "add-circle"
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Layout.preferredWidth: 20
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Layout.preferredHeight: 20
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}
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}
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}
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}
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@ -32,3 +32,4 @@ StatusMessageDetails 0.1 StatusMessageDetails.qml
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StatusTagSelector 0.1 StatusTagSelector.qml
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StatusToastMessage 0.1 StatusToastMessage.qml
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StatusWizardStepper 0.1 StatusWizardStepper.qml
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StatusImageCropPanel 0.1 StatusImageCropPanel.qml
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