Blender源码分析之屏幕和区域对象结构

Posted 2022-04-15 caimouse

在Blender的设计里，UI是采用单一系统窗口的设计，比如在Windows系统里，只需要创建一个窗口，然后所有的绘制和子窗口都是自己在这个窗口里实现，并且不再使用系统的UI功能，全部是自己通过OpenGL实现。所以在Blender每一个系统窗口采用一个屏幕对象结构--bScreen数据结构来描述，然后在屏幕里再分割子窗口--screen area。因此我们先要来学习bScreen数据结构，才能明白UI是怎么样实现屏幕级别的层次。

typedef struct bScreen 

  ID id;



  /* TODO: Should become ScrAreaMap now.

   * NOTE: KEEP ORDER IN SYNC WITH #ScrAreaMap! (see AREAMAP_FROM_SCREEN macro above). */

  /** Screens have vertices/edges to define areas. */

  ListBase vertbase;

  ListBase edgebase;

  ListBase areabase;

  /* End variables that must be in sync with #ScrAreaMap. */



  /** Screen level regions (menus), runtime only. */

  ListBase regionbase;



  struct Scene *scene DNA_DEPRECATED;



  /** General flags. */

  short flag;

  /** Winid from WM, starts with 1. */

  short winid;

  /** User-setting for which editors get redrawn during anim playback.