static控件重绘问题

丧德·彪夫斯基 · 发表于 2019-10-9 18:12:36

很有趣的现象：重绘static采取重设控件属性SS_OWNERDRAW实现的时候，特么的发现属性解释出现了差异，具体如下：

SS_ENHMETAFILE | SS_LEFT == SS_OWNERDRAW | SS_RIGHT

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这就搞笑了，系统在解释属性的时候与预期不符：
spy去看了一下，系统是按照 SS_ENHMETAFILE | SS_LEFT 进行解释的，但我要的是右对齐呀 SS_RIGHT ???

spy 截图和代码如下：

spy截图

/*
win32的static控件 SS_RIGHT(右对齐) 似乎有点问题
*/
#include <windows.h>
#include <windowsx.h>
#include <commctrl.h>
#include <stdio.h>
#include <string.h>
#pragma comment(lib,"user32.lib")
#pragma comment(lib,"gdi32.lib")
#pragma comment(lib,"kernel32.lib")
#pragma comment(lib,"comctl32.lib")
#pragma comment(lib,"shell32.lib")
#define WM_STATICCUSTOMDRAW (UINT)(WM_USER+0x1001)
HFONT setfont(HDC hdc,LPCTSTR font_name);
int Static_draw(HWND hwnd,HDC hdc,RECT rect,UINT itemState);
LRESULT CALLBACK StaticProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
LRESULT CALLBACK ContainerProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
#define ID_STATIC_01 0x0001
#define ID_STATIC_02 0x0002
HINSTANCE GInstance;
void regist_window(char* class_name,WNDPROC proc);
void InitialWindow(HWND hwnd);
LRESULT CALLBACK MainWndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
HFONT setfont(HDC hdc,LPCTSTR font_name)
{
LOGFONT lf;
HFONT pre_font = (HFONT)GetCurrentObject(hdc,OBJ_FONT);
HFONT text_font;
if(pre_font) {
GetObject(pre_font,sizeof(LOGFONT),&lf);
strcpy(lf.lfFaceName,font_name);
text_font = CreateFontIndirect(&lf);
}
pre_font = (HFONT)SelectObject(hdc,text_font);
return pre_font;
}
int Static_draw(HWND hwnd,HDC hdc,RECT rect,UINT itemState)
{
char* text;
HFONT pre_font;
HBRUSH brush,pre_brush;
COLORREF color_text = RGB(255,255,255);
COLORREF color_bk = RGB(0,0,0);
int length;
length = GetWindowTextLength(hwnd);
text = (char*)malloc(sizeof(char)*(length+1));
memset(text,0x00,length+1);
GetWindowText(hwnd,text,length+1);
pre_font = setfont(hdc,"微软雅黑");
brush = CreateSolidBrush(color_bk);
pre_brush = (HBRUSH)SelectObject(hdc,brush);
Rectangle(hdc,rect.left,rect.top,rect.right,rect.bottom);
SetTextColor(hdc,color_text);
SetBkMode(hdc,TRANSPARENT);
//SS_RIGHT
UINT window_style=GetWindowLong(hwnd,GWL_STYLE);
if((UINT)(GetWindowLong(hwnd,GWL_STYLE)&(UINT)SS_RIGHT)==(UINT)SS_RIGHT)
DrawText(hdc,text,-1,&rect,DT_RIGHT);//DT_WORDBREAK|DT_EDITCONTROL|
else DrawText(hdc,text,-1,&rect,DT_WORDBREAK|DT_EDITCONTROL);
DeleteObject(SelectObject(hdc,pre_font));
DeleteObject(SelectObject(hdc,pre_brush));
free(text);
return 0;
}
LRESULT CALLBACK StaticProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
WNDPROC Ori_STCProc = (WNDPROC)GetWindowLong(hwnd,GWL_USERDATA);
switch(message){
case WM_STATICCUSTOMDRAW:
{
LPDRAWITEMSTRUCT draw_struct = (LPDRAWITEMSTRUCT)lParam;
HDC hdc = draw_struct->hDC;
RECT rect;
CopyRect(&rect,&(draw_struct->rcItem));
Static_draw(hwnd,hdc,rect,draw_struct->itemState);
return TRUE;
}
break;
case WM_ERASEBKGND:
{
//avoid control flicker
return 1;
}
break;
}
return CallWindowProc(Ori_STCProc,hwnd,message,wParam,lParam);
}
LRESULT CALLBACK ContainerProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
WNDPROC Ori_ParentProc = (WNDPROC)GetWindowLong(hwnd,GWL_USERDATA);
switch(message){
case WM_DRAWITEM:
{
LPDRAWITEMSTRUCT draw_struct = (LPDRAWITEMSTRUCT)lParam;
if(draw_struct->CtlType == ODT_STATIC) {
return SendMessage(draw_struct->hwndItem,WM_STATICCUSTOMDRAW,wParam,lParam);
}
}
break;
}
return CallWindowProc(Ori_ParentProc,hwnd,message,wParam,lParam);
}
void regist_window(char* class_name,WNDPROC proc)
{
WNDCLASSEX wndclass;
wndclass.cbSize=sizeof(wndclass);
wndclass.style = NULL;//CS_HREDRAW|CS_VREDRAW;
wndclass.lpfnWndProc = proc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = GInstance;
wndclass.hIcon = NULL;
wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)CreateSolidBrush(RGB(0,0,0));
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = class_name;
wndclass.hIconSm = NULL;
RegisterClassEx(&wndclass);
}
int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
GInstance = hInstance;
char szClassName[]="BACK_PANEL";
regist_window(szClassName,MainWndProc);
HWND hwnd = CreateWindowEx(0,
szClassName,
szClassName,
WS_THICKFRAME|WS_CAPTION|WS_OVERLAPPEDWINDOW|WS_MINIMIZEBOX|WS_MAXIMIZEBOX|WS_CLIPCHILDREN,
200,
50,
800,
600,
NULL,
NULL,
hInstance,
NULL);
if(hwnd == NULL)
{
MessageBox(NULL,"create windows error !","error",MB_OK);
return -1;
}
ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);
MSG msg;
while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int) msg.wParam;
}
LRESULT CALLBACK MainWndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
switch(message)
{
case WM_CREATE:
{
InitialWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
break;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}
void InitialWindow(HWND hwnd)
{
HWND static_hwnd = CreateWindow(TEXT("Static"),
"Text.",
WS_BORDER|WS_CHILD|WS_VISIBLE|SS_OWNERDRAW|SS_RIGHT,
50, 50, 250,315,
hwnd,
(HMENU)ID_STATIC_01,
GInstance,
NULL);
SetWindowLong(static_hwnd,GWL_USERDATA,(LONG)GetWindowLong(static_hwnd,GWL_WNDPROC));
SetWindowLong(static_hwnd,GWL_WNDPROC,(LONG)StaticProc);
SetWindowLong(hwnd,GWL_USERDATA,(LONG)GetWindowLong(hwnd,GWL_WNDPROC));
SetWindowLong(hwnd,GWL_WNDPROC,(LONG)ContainerProc);
{
//SetWindowLong(static_hwnd,GWL_EXSTYLE,WS_EX_RIGHT|GetWindowLong(static_hwnd,GWL_EXSTYLE));//似乎与 GWL_EXSTYLE 没有关系
char attribution_buffer[256]="";
UINT static_attri=(UINT)GetWindowLong(static_hwnd,GWL_STYLE);
sprintf(attribution_buffer,"WS_BORDER:0x%08X\n"
"WS_CHILDWINDOW:0x%08X\n"
"WS_VISIBLE:0x%08X\n"
"SS_OWNERDRAW:0x%08X\n"
"SS_RIGHT:0x%08X\n"
"Current style:0x%08X\n"
"SIZEOF(UINT):%d\n"
"SS_ENHMETAFILE:0x%08X\n"
"SS_LEFT:0x%08X\n",
WS_BORDER,WS_CHILDWINDOW,WS_VISIBLE,SS_OWNERDRAW,SS_RIGHT,
static_attri,
sizeof(UINT),
SS_ENHMETAFILE,SS_LEFT);
HWND static_desc= CreateWindow(TEXT("Static"),
attribution_buffer,
WS_BORDER|WS_CHILD|WS_VISIBLE,
310, 50, 250,315,
hwnd,
(HMENU)ID_STATIC_02,
GInstance,
NULL);
}
}

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love_cctry · 发表于 2019-10-9 22:30:57

这个帖子中貌似有楼主要的答案，虽然我没完全看懂这个英文，哈哈
https://social.msdn.microsoft.com/Forums/vstudio/en-US/8b96363b-946b-41fa-bc45-e595861e3b22/win32-how-change-the-static-text-alignment?forum=vclanguage

丧德·彪夫斯基 · 发表于 2019-10-10 09:28:40

love_cctry 发表于 2019-10-9 22:30
这个帖子中貌似有楼主要的答案，虽然我没完全看懂这个英文，哈哈
https://social.msdn.microsoft.com/Foru ...

从头翻到尾，最终的实现，他在控件之外用一个外部变量标识和识别对齐方式。这破坏了控件数据（样式）的独立性和完整性，不是一个理想的解决方案。

SS_OWERDRAW = 0x00000D = 0x00001101 （）本身是一个组合标识位）
= 0x00001000 | 0x00000100 | 0x00000001

丧德·彪夫斯基 · 发表于 2019-10-10 10:14:10

某些类似的问题在这里也被提到了：
http://msgroups.net/microsoft.public.vc.mfc/ss_right-and-ss_ownerdraw/575661

一种凑合的使用方式是错误的使用（不可靠的复用）WS_EX_RIGHT 样式：

void InitialWindow(HWND hwnd)
{
HWND static_hwnd = CreateWindow(TEXT("Static"),
"Text.",
WS_BORDER|WS_CHILD|WS_VISIBLE|SS_OWNERDRAW,
50, 50, 250,315,
hwnd,
(HMENU)ID_STATIC_01,
GInstance,
NULL);
......
[color=Red]SetWindowLong(static_hwnd,GWL_EXSTYLE,WS_EX_RIGHT|GetWindowLong(static_hwnd,GWL_EXSTYLE));[/color]
......
}
int Static_draw(HWND hwnd,HDC hdc,RECT rect,UINT itemState)
{
......
[color=Red]if((UINT)(GetWindowLong(hwnd,GWL_EXSTYLE)&(UINT)WS_EX_RIGHT)==(UINT)WS_EX_RIGHT) [/color]
DrawText(hdc,text,-1,&rect,DT_RIGHT);//DT_WORDBREAK|DT_EDITCONTROL|
else DrawText(hdc,text,-1,&rect,DT_WORDBREAK|DT_EDITCONTROL);
......
}

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