import QtQuick 2.2 import QtQuick.Controls 1.2 import QGroundControl.ScreenTools 1.0 // This item can be dragged around within its parent. // Double click issues a signal the parent can use to // reset its default position. Item { id: root property bool allowDragging: true property real minimumWidth: ScreenTools.defaultFontPixelHeight * (5) property real minimumHeight: ScreenTools.defaultFontPixelHeight * (5) property alias tForm: tform signal resetRequested() transform: Scale { id: tform } MouseArea { property double factor: 25 enabled: root.allowDragging cursorShape: Qt.OpenHandCursor anchors.fill: parent drag.target: parent drag.axis: Drag.XAndYAxis drag.minimumX: 0 drag.minimumY: 0 drag.maximumX: root.parent.width - (root.width * tform.xScale) drag.maximumY: root.parent.height - (root.height * tform.yScale) drag.filterChildren: true onPressed: { root.anchors.left = undefined root.anchors.right = undefined } onDoubleClicked: { root.resetRequested(); } onWheel: { var zoomFactor = 1; if(wheel.angleDelta.y > 0) zoomFactor = 1 + (1/factor) else zoomFactor = 1 - (1/factor) var realX = wheel.x * tform.xScale var realY = wheel.y * tform.yScale var tx = root.x + (1-zoomFactor)*realX var ty = root.y + (1-zoomFactor)*realY if(tx < 0) tx = 0 if(ty < 0) ty = 0 var ts = tform.xScale * zoomFactor if(root.width * ts >= root.minimumWidth) { if(root.height * ts >= root.minimumHeight) { if(((root.width * ts) + tx) < root.parent.width && ((root.height * ts) + ty) < root.parent.height) { root.x = tx root.y = ty tform.xScale = ts tform.yScale = ts } } } } } }