如何在Java(SWT)中重新粉刷合成物? [英] How can i repaint a composite in Java (SWT)?

问题描述

当我在我的swt程序中按一个按钮时，应该绘制一个新的合成物.但是，复合材料仅在我调整窗口大小时显示. 我在gui中有一个合成(compLoad)，它被分配了一个新的合成

When i press a button in my swt program, a new composite should be drawn. But the composite only displays if i resize the window. I have a composite (compLoad) in my gui which is assigned a new composite

compHELP comHelp_ = new compHELP(compLoad, SWT.RESIZE);

我尝试了redraw()，但没有任何反应

i have tried redraw() but nothing happens

推荐答案

添加/删除控件时，需要重新布置复合结构，请参见

Composite.layout() // uses Composite.layout(true)
Composite.layout(boolean changed) 
Composite.layout(boolean changed, boolean all)

请注意，SWT中的布局可能缓存其控件的首选大小(由确定).在添加新组件时，对layout()的调用可能就足够了.如果首选尺寸可能已更改，或者更改发生在子复合材料中，请使用带有changed/all标志的方法来确保正确更新了版式.

Note that layouts in SWT may cache the preferred size of its controls (determined by Control.computeSize(int w, int h)). As you are adding new components, a call to layout() might be sufficient. In cases where the preferred size is likely to have been changed, or the change happens in a sub-composite, use the method with the changed/all flags to make sure your layout is properly updated.

旁注:更改Composite的大小时，它将自动重新布局(如在调整窗口大小时所注意到的那样).

Side note: when the size of a Composite is changed, it will be automatically re-layouted (as you noticed when resizing the window).

这篇关于如何在Java(SWT)中重新粉刷合成物?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！