Codename One拖动的容器迅速消失

huangapple
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英文:

Codename One dragged-over container quickly dissappears

问题

  1. 我有一个使用拖放操作的Android应用程序。我并不经常使用拖放操作，所以我刚开始学习它们的工作原理以及可能的影响。
  3. 在我的应用程序中，无论何时我将组件放在目标上方，目标会出现一种“闪烁”的效果，意味着它会在短暂的时刻内消失，然后再次出现。
  5. 这里是一个[链接][1]，展示了应用程序的当前阶段。
  7. 我猜这可能是由于表单的动画效果。如果是这样，我应该如何禁用它，或者阻止目标闪烁？
  9. 以下是我的代码。由于我刚开始着手这个项目，代码还很基础。
  11. ```java
  12. public void testDrag () {
  13.     Container containerDropTarget = new Container();
  14.     Container container = new Container(new GridLayout(5,1));
  15.     Label label = new Label("test test test test test test");
  16.     Button buttonTwo = new Button("Test");
  18.     buttonTwo.addDragOverListener(l-> {
  19.         containerDropTarget.setUIID("DialogTest");
  20.     });
  22.     containerDropTarget.setUIID("LetterHolder");
  24.     buttonTwo.setDraggable(true);
  25.     containerDropTarget.setDropTarget(true);
  27.     container.add(label).add(containerDropTarget);
  29.     form.add(container).add(buttonTwo);
  30.     form.show();
  31. }
英文:

I have an Android application that uses drag and drop operations. I haven't used drag and drop often, so I am just starting to learn how they work and what the implications might be.

In my app, whenever I drop the component over the target, the target sort of "flashes", meaning it disappears for a brief moment and than reappears again.

Here a link to the video with the app in its current stage.

I suppose this is due to the animation of the form. If so, how can I disable it, or stop the target from flashing?

Below is my code. It is still rudimentary, since I just started to work on the project.

  1. public void testDrag () {
  3. 	Container containerDropTarget = new Container();
  4. 	Container container = new Container(new GridLayout(5,1));
  5. 	Label label = new Label("test test test test test test");
  6. 	Button buttonTwo = new Button("Test");
  7. 	
  8. 	buttonTwo.addDragOverListener(l-> {
  9. 		containerDropTarget.setUIID("DialogTest");
  10. 	});
  11. 	
  12. 	containerDropTarget.setUIID("LetterHolder");
  13. 	
  14. 	buttonTwo.setDraggable(true);
  15. 	containerDropTarget.setDropTarget(true);
  16. 	
  17. 	container.add(label).add(containerDropTarget);
  18. 	
  19. 	form.add(container).add(buttonTwo);
  20. 	form.show();
  21. }

答案1

得分: 1

我没有定义UIIDs，所以我使用了基于您的测试案例的这段代码，并且它正常工作。我还向拖放容器添加了一个标签，以便可以找到它：

  1. Container containerDropTarget = new Container() {
  2.     @Override
  3.     public void drop(Component dragged, int x, int y) {
  4.         super.drop(dragged, x, y); 
  5.         setUIID("Container");
  6.     }
  7. };
  8. containerDropTarget.add(new Label("Drop Target"));
  9. Form form = new Form("Test Drag", BoxLayout.y());
  10. Container container = new Container(new GridLayout(5,1));
  11. Label label = new Label("test test test test test test");
  12. Button buttonTwo = new Button("Test");
  14. buttonTwo.addDragOverListener(l-> {
  15.     //containerDropTarget.setUIID("DialogTest");
  16.     containerDropTarget.getAllStyles().setBgColor(0xff0000);
  17.     containerDropTarget.getAllStyles().setBgTransparency(0xff);
  18.     containerDropTarget.repaint();
  19. });
  21. containerDropTarget.setUIID("LetterHolder");
  23. buttonTwo.setDraggable(true);
  24. containerDropTarget.setDropTarget(true);
  26. container.add(label).add(containerDropTarget);
  28. form.add(container).add(buttonTwo);
  29. form.show();
英文:

I don't have the UIIDs defined so I used this code based on your test case and it worked correctly. I also added a label to the drop container so it could be found:

  1. Container containerDropTarget = new Container() {
  2.     @Override
  3.     public void drop(Component dragged, int x, int y) {
  4.         super.drop(dragged, x, y); 
  5.         setUIID("Container");
  6.     }
  7. };
  8. containerDropTarget.add(new Label("Drop Target"));
  9. Form form = new Form("Test Drag", BoxLayout.y());
  10. Container container = new Container(new GridLayout(5,1));
  11. Label label = new Label("test test test test test test");
  12. Button buttonTwo = new Button("Test");
  14. buttonTwo.addDragOverListener(l-> {
  15.     //containerDropTarget.setUIID("DialogTest");
  16.     containerDropTarget.getAllStyles().setBgColor(0xff0000);
  17.     containerDropTarget.getAllStyles().setBgTransparency(0xff);
  18.     containerDropTarget.repaint();
  19. });
  21. containerDropTarget.setUIID("LetterHolder");
  23. buttonTwo.setDraggable(true);
  24. containerDropTarget.setDropTarget(true);
  26. container.add(label).add(containerDropTarget);
  28. form.add(container).add(buttonTwo);
  29. form.show();

huangapple
  • 本文由 发表于 2020年9月17日 03:51:55
  • 转载请务必保留本文链接：https://go.coder-hub.com/63927093.html
  • codenameone
  • drag-and-drop
  • java
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