一、窗口操作的要点
0、调试时观察的全局变量WM__NumWindows、WM__NumInvalidWindows、WM__FirstWin、NextDrawWin。
1、 创建一个窗口的时候，会给此窗口发送“创建”消息，从而执行它的回到函数；如果创建窗口的状态标志为“可视（WM_CF_SHOW）”，那么在执行GUI_Exec函数时会对窗口进行重绘。如果创建窗口的标志带有WM_CF_ACTIVATE，那么这个窗口在创建的时候也会被激活，否则不激活。
2、 WM_SendMessage()发送消息的函数，本身也是执行消息的函数（通过调用接收方的回调函数），所以调用发送消息的函数发送的消息只可能被处理一次
3、 WM_SelectWindow()选中窗口的意思是：接下来操作（画画、写字）的对象是选中的窗口
4、 删除一个窗口的时候，会给它父亲发送“孩子被删除”的消息，也会给删除窗口自己发送“删除消息”，删除一个窗口的时候会把它的孩子依次删除（递归调用）删除一个窗口的时候，也会使与之有黏贴关系的窗口（比方说其父窗口）设置为无效，将来执行WM_Exec()时对这些窗口进行重绘。
5、 重绘的操作，虽然最后WM_Exec()也给窗口发送重绘消息进行的。但是，实际上重绘不是立即执行的，用户为了使窗口重绘。可以使窗口变为无效，而且无效窗口总数加1，来实现在执行GUI_Exec(）或者WM_Exec()时对窗口的重绘。
6、 WM_SetBkWindowColor()设置桌面背景，也会对桌面进行重绘
7、 如果不设置桌面窗口背景，桌面是不可能被重绘的。这是因为桌面窗口默认的背景颜色是无效的颜色。
8、 GUI_Clear()函数，使用时清除的是当前激活的窗口。GUI_Clear()函数是底层的GUI显示函数，用户调用马上就能见到效果。它设置的颜色取自全局变量GUI_Context中的BkColor。
9、 GUI_Exec()或者WM_Exec()会完成所有的重绘工作，才退出函数的执行。 WM_SelectWindow()可以给窗口发送重绘消息，而且这种重绘立即被执行。GUI_Exec或者WM_Exec(),它们在重绘的时候按照从桌面依次到高级别的窗口，最后到顶层窗口的顺序进行重绘。因此，重绘的过程中，肯定会不断的激活不同的窗口，而且会不断的更改全局变量GUI_Context其他的参数值。在执行完GUI_Exec或者WM_Exec()的时候，GUI_Context还能恢复到执行之前的状态，这也是我们希望看到的。
10、 桌面是最底层的窗口，依次向上是高级的窗口
11、 创建桌面窗口的时候，默认的是需要对其重绘的。
12、 WM_SetCallback设置窗口的回调函数，会使窗口无效，引起窗口的重绘。
13、WM_ShowWindow()会使当前窗口无效，并设置窗口标志为可视“WM_SF_ISVIS”。
14、WM_HideWindow（）会使其父亲和其同胞无效，并将其窗口可视标志“WM_SF_ISVIS”清除。
15、 GUI_TM_NORMAL、GUI_TM_REV、GUI_TM_TRANS这些模式都不会引起对像素颜色的读取。而GUI_TM_XOR会对像素的颜色进行读取。
16、创建一个列表框，默认的选择是第一行，对应的选项序号是0。一个列表框对应的是一个窗口，但是它占用的动态内存却是数个32字节。
二、与窗口有关的结构体
1、WM_Obj
/* 窗体管理结构体 共30个字节 */
struct WM_Obj {
GUI_RECT Rect; //窗体尺寸(x0,y0,x1,y1) 8个字节
GUI_RECT InvalidRect; //无效区域(x0,y0,x1,y1) 8个字节
WM_CALLBACK* cb; //回调函数 4个字节
WM_HWIN hNextLin; //指向链表中的下一个窗体 2个字节
WM_HWIN hParent; //当前窗体的父窗体 2个字节
WM_HWIN hFirstChild; //当前窗体的第一个子窗体 2个字节
WM_HWIN hNext; //下一个兄弟窗体 2个字节
U16 Status; //标志位 2个字节
};
2、WM_MESSAGE
struct WM_MESSAGE {
int MsgId; //信息的类型
WM_HWIN hWin; //信息的接收窗口
WM_HWIN hWinSrc; //发送信息的源窗口
union {
const void* p;
int v;
GUI_COLOR Color;
} Data;
};
①Messages Ids
/*********************************************************************
*
* Messages Ids
The following is the list of windows messages.
*/
#define WM_CREATE 0x0001 /* The first message received, right after client has actually been created */
#define WM_MOVE 0x0003 /* window has been moved (Same as WIN32) */
#define WM_SIZE 0x0005 /* Is sent to a window after its size has changed (Same as WIN32, do not change !) */
#define WM_DELETE 11 /* Delete (Destroy) command: This tells the client to free its data strutures since the window it is associates with no longer exists.*/
#define WM_TOUCH 12 /* Touch screen message */
#define WM_TOUCH_CHILD 13 /* Touch screen message to ancestors */
#define WM_KEY 14 /* Key has been pressed */
#define WM_PAINT 0x000F /* Repaint window (because content is (partially) invalid */
#if GUI_SUPPORT_MOUSE
#define WM_MOUSEOVER 16 /* Mouse has moved, no key pressed */
#define WM_MOUSEOVER_END 18 /* Mouse has moved, no key pressed */
#endif
#define WM_PID_STATE_CHANGED 17 /* Pointer input device state has changed */
#define WM_GET_INSIDE_RECT 20 /* get inside rectangle: client rectangle minus pixels lost to effect */
#define WM_GET_ID 21 /* Get id of widget */
#define WM_SET_ID 22 /* Set id of widget */
#define WM_GET_CLIENT_WINDOW 23 /* Get window handle of client window. Default is the same as window */
#define WM_CAPTURE_RELEASED 24 /* Let window know that mouse capture is over */
#define WM_INIT_DIALOG 29 /* Inform dialog that it is ready for init */
#define WM_SET_FOCUS 30 /* Inform window that it has gotten or lost the focus */
#define WM_GET_ACCEPT_FOCUS 31 /* Find out if window can accept the focus */
#define WM_NOTIFY_CHILD_HAS_FOCUS 32 /* Sent to parent when child receives / loses focus */
#define WM_NOTIFY_OWNER_KEY 33 /* Some widgets (e.g. listbox) notify owner when receiving key messages */
#define WM_GET_BKCOLOR 34 /* Return back ground color (only frame window and similar) */
#define WM_GET_SCROLL_STATE 35 /* Query state of scroll bar */
#define WM_SET_SCROLL_STATE 36 /* Set scroll info ... only effective for scrollbars */
#define WM_NOTIFY_CLIENTCHANGE 37 /* Client area may have changed */
#define WM_NOTIFY_PARENT 38 /* Notify parent. Information is detailed as notification code */
#define WM_NOTIFY_PARENT_REFLECTION 39 /* Notify parent reflection.
Sometimes send back as a result of the WM_NOTIFY_PARENT message
to let child react on behalf of its parent.
Information is detailed as notification code */
#define WM_NOTIFY_ENABLE 40 /* Enable or disable widget */
#define WM_NOTIFY_VIS_CHANGED 41 /* Visibility of a window has or may have changed */
#define WM_HANDLE_DIALOG_STATUS 42 /* Set or get dialog status */
#define WM_GET_RADIOGROUP 43 /* Send to all siblings and children of a radio control when
selection changed */
#define WM_MENU 44 /* Send to owner window of menu widget */
#define WM_SCREENSIZE_CHANGED 45 /* Send to all windows when size of screen has changed */
#define WM_TIMER 0x0113 /* Timer has expired (Keep the same as WIN32) */
#define WM_WIDGET 0x0300 /* 256 messages reserved for Widget messages */
#define WM_USER 0x0400 /* Reserved for user messages ... (Keep the same as WIN32) */
/*********************************************************************
*
* Notification codes
*
* The following is the list of notification codes send
* with the WM_NOTIFY_PARENT message
*/
#define WM_NOTIFICATION_CLICKED 1
#define WM_NOTIFICATION_RELEASED 2
#define WM_NOTIFICATION_MOVED_OUT 3
#define WM_NOTIFICATION_SEL_CHANGED 4
#define WM_NOTIFICATION_VALUE_CHANGED 5
#define WM_NOTIFICATION_SCROLLBAR_ADDED 6 /* Scroller added */
#define WM_NOTIFICATION_CHILD_DELETED 7 /* Inform window that child is about to be deleted */
#define WM_NOTIFICATION_GOT_FOCUS 8
#define WM_NOTIFICATION_LOST_FOCUS 9
#define WM_NOTIFICATION_SCROLL_CHANGED 10
#define WM_NOTIFICATION_WIDGET 11 /* Space for widget defined notifications */
#define WM_NOTIFICATION_USER 16 /* Space for application (user) defined notifications */
三、窗口重绘的过程
GUI_Exec()-->
GUI_Exec1()-->
WM_Exec()-->
WM_Exec1()-->
_DrawNext-->
WM__Paint-->
WM_PaintWinAndOvlays-->
__Paint1-->
WM_SendMessage-->
WmCallback（回调函数）
四、窗口创建的标志
#define WM_CF_HASTRANS (1<<0) /* Has transparency. Needs to be defined for windows which do not fill the entire
section of their (client) rectangle. */
#define WM_CF_HIDE (0<<1) /* Hide window after creation (default !) */
#define WM_CF_SHOW (1<<1) /* Show window after creation */
#define WM_CF_MEMDEV (1<<2) /* Use memory device for redraws */
#define WM_CF_STAYONTOP (1<<3) /* Stay on top */
#define WM_CF_DISABLED (1<<4) /* Disabled: Does not receive PID (mouse & touch) input */
/* Create only flags ... Not available as status flags */
#define WM_CF_ACTIVATE (1<<5) /* If automatic activation upon creation of window is desired */
#define WM_CF_FGND (0<<6) /* Put window in foreground after creation (default !) */
#define WM_CF_BGND (1<<6) /* Put window in background after creation */
/* Anchor flags */
#define WM_CF_ANCHOR_RIGHT (1<<7) /* Right anchor ... If parent is resized, distance to right will remain const (left is default) */
#define WM_CF_ANCHOR_BOTTOM (1<<8) /* Bottom anchor ... If parent is resized, distance to bottom will remain const (top is default) */
#define WM_CF_ANCHOR_LEFT (1<<9) /* Left anchor ... If parent is resized, distance to left will remain const (left is default) */
#define WM_CF_ANCHOR_TOP (1<<10) /* Top anchor ... If parent is resized, distance to top will remain const (top is default) */
#define WM_CF_CONST_OUTLINE (1<<11) /* Constant outline. This is relevant for transparent windows only. If a window is transparent
and does not have a constant outline, its background is invalided instead of the window itself.
This causes add. computation time when redrawing. */
#define WM_CF_LATE_CLIP (1<<12)
#define WM_CF_MEMDEV_ON_REDRAW (1<<13)
#define WM_CF_RESERVED3 (1<<14)
#define WM_CF_RESERVED4 (1<<15)
五、桌面窗口的默认回调函数
static void cbBackWin( WM_MESSAGE* pMsg) {
const WM_KEY_INFO* pKeyInfo;
switch (pMsg->MsgId) {
case WM_KEY:
pKeyInfo = (const WM_KEY_INFO*)pMsg->Data.p;
if (pKeyInfo->PressedCnt == 1) {
GUI_StoreKey(pKeyInfo->Key);
}
break;
case WM_PAINT:
{
int LayerIndex;
#if GUI_NUM_LAYERS > 1
LayerIndex = _DesktopHandle2Index(pMsg->hWin);
#else
LayerIndex = 0;
#endif
if (WM__aBkColor[LayerIndex] != GUI_INVALID_COLOR) {
GUI_SetBkColor(WM__aBkColor[LayerIndex]);
GUI_Clear();
}
}
default:
WM_DefaultProc(pMsg);
}
}
时间： 2024-12-16 13:41:59