如何同时更改控件，而不需要重新绘制？ [英] How to change controls simultaneously without repainting each one?

问题描述

例如，我需要在运行时禁用两个按钮。当我禁用第一个按钮后，它会变灰，第二个 - 它也变灰了。但我不知道如何使重画同时进行！

我需要这样的东西：

1. 冻结Form（禁用重绘）


2. 禁用第一个按钮


3. 禁用第二个按钮


4. 启用重新绘制表单

如何实现？

解决方案

查看Win32 API WM_SETREDRAW 消息。例如：

  SendMessage（Handle，WM_SETREDRAW，False，0）; 
 Button1.Enabled：= False; 
 Button2.Enabled：= False; 
 SendMessage（Handle，WM_SETREDRAW，True，0）; 
 InvalidateRect（Handle，nil，True）; 
  

For example I need to disable two buttons in runtime. After I disabled first button it bacame gray, the second - it also became gray. But I do not know how to make the repainting simultaneous!

I need something like that:

1. freeze the Form (disable repainting)
2. disable first button
3. disable second button
4. Enable Form repainting

How to implement that?

解决方案

Look at the Win32 API WM_SETREDRAW message. For example:

SendMessage(Handle, WM_SETREDRAW, False, 0);
Button1.Enabled := False;
Button2.Enabled := False;
SendMessage(Handle, WM_SETREDRAW, True, 0);
InvalidateRect(Handle, nil, True);

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