How to move a box on screen
Hello
I just started to develop in the Cascades and spent the afternoon by downloading samples and by reading the documentation. My question is about the simple example of Cascades ' Hello world '. Namely, I tried to combine it with a gesture touch, but I can not understand how to operate correctly. The idea is the following: tap on the bubble, and then slip around or tapping the screen a bubble jumps to the tapped coordinate. I guess the "translationX, translationY" in the notecard body is bad, but I have no idea how fix it.
Thanks in advance,
import bb.cascades 1.0 Page { // A container is used to gather visual items together. content:Container { attachedObjects: [ // Non UI objects are specified as attached objects ImagePaintDefinition { id: backgroundPaint imageSource: "asset:///images/background.png" } ] layout: DockLayout { } background: backgroundPaint.imagePaint // The container containing the bubble image and text Container { id: movingBubble horizontalAlignment: HorizontalAlignment.Center verticalAlignment: VerticalAlignment.Center layout: DockLayout { } // The bubble image ImageView { imageSource: "asset:///images/bubble.png" } // A text label with the comforting hello world text Label { text: qsTr("Hello World") + Retranslate.onLanguageChanged // The Label text style. textStyle.base: SystemDefaults.TextStyles.BigText textStyle.fontWeight: FontWeight.Bold textStyle.color: Color.create("#ff5D5D5D") // Center the text in the container. verticalAlignment: VerticalAlignment.Center horizontalAlignment: HorizontalAlignment.Center }// Label }// Container onTouch: { movingBubble.translationX = event.localX - (movingBubble.preferredWidth / 2); movingBubble.translationY = event.localY - (movingBubble.preferredHeight / 2); } }// Container }// Page
Other code, for when you do not have a width/height preferred;
Container { id: movingBubble property int lastY; property int lastX;
Snip
onTouch: { if (event.isDown()) { movingBubble.lastX = event.localX; movingBubble.lastY = event.localY; } else if (event.isMove()) { movingBubble.translationX += event.localX - movingBubble.lastX; movingBubble.translationY += event.localY - movingBubble.lastY; movingBubble.lastX = event.localX; movingBubble.lastY = event.localY; } }
Tags: BlackBerry Developers
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