GdiplusFlat（10）自绘Edit Control边框的实现（附Edit Control垂直居中问题）

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在上几篇中，我们说到了通过GdipCreateFromHDC函数将HDC（设备上下文句柄）装换成GDI+的Graphics对象，讲到了画笔和画刷的使用，演示了何利用GDI+Flat来画图片和画文字，讲到了双缓冲绘图和DC复制，并说了用GdiplusFlat来绘制按钮的两种方法。

这篇我们来说说自绘Edit Control边框的实现。

还是和以前一样，我们必须自己声明GDI+Flat函数，自己定义GDI+Flat的数据结构。自己动手，丰衣足食。~~

首先说一说Edit Control垂直居中的问题。

正常情况下，即使是单行Edit，也不能垂直居中（左图）：

经过优化以后，就可以垂直居中了，如右图。

具体代码如下，edit是Edit Control的句柄。

首先需要给Edit Control添加ES_MULTILINE多行风格（具体见我以前一篇关于Edit Control的博文）

TEXTMETRIC tm;GetTextMetrics(GetDC(edit), &tm);//获取字体信息RECT rect;GetClientRect(edit, &rect);//获取edit矩形OffsetRect(&rect, 0, (100 - tm.tmHeight)/2);//移动矩形rect.bottom = rect.top + tm.tmHeight;//设置RECT的底边坐标SendMessage(edit, EM_SETRECT, 0, (LPARAM)&rect);//设置矩形

可能有人会不明白rect.bottom = rect.top + tm.tmHeight;这一句是干嘛用的，其实，如果Edit Control比较高，不添加这一句虽然文字也居中了，但是不要忘了我们添加了ES_MULTILINE风格，虽然没有接受回车的风格，但是竟然可以换行直到控件底部，这是不能容忍的，所以这一句把矩形限制在了这一行，只要我们不加ES_AUTOVSCROLL风格，就不用再担心这个问题了。

好了，先来看看效果：

（1）

（2）

还不错吧。。完整源码：

（注意：自绘Edit Control边框可以但是不需要使用双缓冲绘图解决，而且使用双缓冲反而会损失效率，至于说原因我就不用说了吧。双缓冲不是万能的，它能解决很多问题，但不一定所有的情况都适合）

（1）源码：

#include "stdafx.h"#include <gdiplus.h>#include <gdiplusflat.h>#pragma comment(lib,"gdiplus.lib")//very important#include <windows.h>#include <windowsx.h>#pragma comment(lib,"user32.lib")#pragma comment(lib,"gdi32.lib")#pragma comment(lib,"Msimg32.lib")//GDI+Flat#define ARGB(a,r,g,b) ((int)(((BYTE)a)<<24)|(((BYTE)r)<<16)|(((BYTE)g)<<8)|((BYTE)b))typedef struct _GdiplusStartupInput{unsigned int GdiplusVersion;unsigned int DebugEventCallback;BOOL SuppressBackgroundThread;BOOL SuppressExternalCodecs;}GdiplusStartupInput;extern "C" int WINAPI GdiplusStartup(int* token, GdiplusStartupInput *input, int *output);extern "C" void WINAPI GdiplusShutdown(int token);extern "C" int WINAPI GdipCreateFromHDC(HDC hdc, int* graphics);extern "C" int WINAPI GdipDeleteGraphics(int graphics);//画笔extern "C" int WINAPI GdipCreatePen1(unsigned int argb_color, float width, int unit, int** pen);extern "C" int WINAPI GdipDeletePen(int* pen);//画矩形 画直线extern "C" int WINAPI GdipDrawRectangle(int graphics, int* pen, float x, float y, float width, float height);extern "C" int WINAPI GdipDrawLine(int graphics, int* pen, float x1, float y1, float x2, float y2);//画刷typedef struct _PointF{float x;float y;}PointF;extern "C" int WINAPI GdipCreateSolidFill(unsigned int argb_color, int** brush);extern "C" int WINAPI GdipCreateLineBrush(PointF* point1, PointF* point2, unsigned int argb_color1, unsigned int argb_color2, int wrapMode, int** lineGradient);extern "C" int WINAPI GdipDeleteBrush(int* brush);//画填充矩形extern "C" int WINAPI GdipFillRectangle(int graphics, int* brush, float x, float y, float width, float height);//画图片extern "C" int WINAPI GdipLoadImageFromFile(WCHAR* filename, int** image);extern "C" int WINAPI GdipLoadImageFromStream(LPSTREAM stream, int** image);extern "C" int WINAPI GdipGetImageDimension(int* image, float* width, float* height);extern "C" int WINAPI GdipDrawImageRect(int graphics, int* image, float x, float y, float width, float height);extern "C" int WINAPI GdipDisposeImage(int* image);//画文字typedef struct _RectF{float x;float y;float Width;float Height;}RectF;extern "C" int WINAPI GdipSetTextRenderingHint(int graphics, int mode);extern "C" int WINAPI GdipSetSmoothingMode(int graphics, int smoothingMode);extern "C" int WINAPI GdipCreateFontFamilyFromName(WCHAR* name, int* fontCollection, int** fontFamily);extern "C" int WINAPI GdipCreateStringFormat(int formatAttributes, short language, int** format);extern "C" int WINAPI GdipSetStringFormatAlign(int* format, int align);extern "C" int WINAPI GdipSetStringFormatLineAlign(int* format, int align);extern "C" int WINAPI GdipCreateFont(int* fontFamily, float emSize, int style, int unit, int** font);extern "C" int WINAPI GdipDrawString(int graphics, WCHAR* string, int length, int* font, RectF* layoutRect, int* stringFormat, int* brush);extern "C" int WINAPI GdipDeleteFont(int* font);extern "C" int WINAPI GdipDeleteStringFormat(int* format);extern "C" int WINAPI GdipDeleteFontFamily(int* fontFamily);int token;int* pen;int* brush;int* linebrush;int* image;//HDC mdc;//*************************************************************LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);WNDCLASS wc;const TCHAR* AppName = TEXT("MyWindowClass1");HWND hwnd1;BOOL Track;WNDPROC lastproc;HWND edit;int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,_In_opt_ HINSTANCE hPrevInstance,_In_ LPTSTR    lpCmdLine,_In_ int       nCmdShow){//GDI+开启GdiplusStartupInput StartupInput = { 0 };StartupInput.GdiplusVersion = 1;if (GdiplusStartup(&token, &StartupInput, NULL))MessageBox(0, TEXT("GdiPlus开启失败"), TEXT("错误"), MB_ICONERROR);//这里是在构建窗口类结构wc.style = CS_HREDRAW | CS_VREDRAW;wc.lpfnWndProc = WndProc;//窗口回调函数指针wc.cbClsExtra = 0;wc.cbWndExtra = 0;wc.hInstance = hInstance;//实例句柄wc.hIcon = LoadIcon(hInstance, TEXT("ICON_1"));wc.hCursor = LoadCursor(NULL, IDC_ARROW);//默认指针wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);wc.lpszMenuName = NULL;wc.lpszClassName = AppName;//窗口类名//注册窗口类if (!RegisterClass(&wc)){MessageBox(NULL, TEXT("注册窗口类失败!"), TEXT("错误"), MB_ICONERROR);return 0;}//创建窗口int style = WS_OVERLAPPEDWINDOW;hwnd1 = CreateWindowEx(NULL, AppName, TEXT("窗口标题"), style, 50, 50, 500, 500, 0, LoadMenu(hInstance, TEXT("MENU1")), hInstance, 0);if (hwnd1 == NULL){MessageBox(NULL, TEXT("创建窗口失败!"), TEXT("错误"), MB_ICONERROR);return 0;}//无边框窗口SetWindowLong(hwnd1, GWL_STYLE, WS_OVERLAPPED | WS_VISIBLE | WS_CLIPCHILDREN | WS_CLIPSIBLINGS);//显示、更新窗口ShowWindow(hwnd1, nCmdShow);UpdateWindow(hwnd1);//消息循环MSG msg;while (GetMessage(&msg, NULL, 0, 0)){TranslateMessage(&msg);DispatchMessage(&msg);}//GDI+关闭GdiplusShutdown(token);//可以把这个写在消息循环后面，程序退出就销毁，或者在不需要GDI+时调用，比如GDI+窗口的WM_DESTROY消息里调用return msg.wParam;}LRESULT CALLBACK Proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam){int xPos, yPos;switch (uMsg){case WM_NCPAINT:HDC hdc;int graphics;hdc = GetWindowDC(hwnd);//获取完整窗口（包括非客户区）DC句柄GdipCreateFromHDC(hdc, &graphics);//创建Graphics对象GdipCreatePen1(ARGB(255, 79, 202, 255), 3, 2, &pen);//创建画笔GdipDrawRectangle(graphics, pen, 0, 0, 120, 20);//画矩形GdipDeletePen(pen);//销毁画笔ReleaseDC(hwnd, hdc);return 0;break;}return CallWindowProc(lastproc, hwnd, uMsg, wParam, lParam);//让原来的窗口回调函数处理其他消息}LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam){switch (uMsg){case WM_CREATE://mdc = CreateCompatibleDC(0);//BITMAPINFO bitmapinfo;//RtlZeroMemory(&bitmapinfo, sizeof(BITMAPINFO));//bitmapinfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);//bitmapinfo.bmiHeader.biWidth = 120;//bitmapinfo.bmiHeader.biHeight = 25;//bitmapinfo.bmiHeader.biPlanes = 1;//bitmapinfo.bmiHeader.biBitCount = 32;//HBITMAP b, old;//b = CreateDIBSection(0, &bitmapinfo, 0, 0, 0, 0);//old = (HBITMAP)SelectObject(mdc, b);//if (old != NULL){//DeleteObject(old);//}//DeleteObject(b);edit = CreateWindowEx(WS_EX_CLIENTEDGE, TEXT("Edit"), TEXT("Edit Control"), WS_CHILD | WS_VISIBLE | ES_LEFT | ES_AUTOHSCROLL | ES_MULTILINE, 20, 20, 121, 21, hwnd, (HMENU)1, (HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE), NULL);SendMessage(edit, WM_SETFONT, (WPARAM)GetStockObject(17), 0);lastproc = (WNDPROC)SetWindowLongPtr(edit, GWL_WNDPROC, (LONG)&Proc);//子类化TEXTMETRIC tm;GetTextMetrics(GetDC(edit), &tm);//获取字体信息RECT rect;GetClientRect(edit, &rect);//获取edit矩形OffsetRect(&rect, 0, (21 - tm.tmHeight) / 2);//移动矩形rect.bottom = rect.top + tm.tmHeight;//设置RECT的底边坐标SendMessage(edit, EM_SETRECT, 0, (LPARAM)&rect);//设置矩形return 0;break;case WM_DESTROY://窗口已经销毁//DeleteDC(mdc);PostQuitMessage(0);//退出消息循环，结束应用程序return 0;break;case WM_LBUTTONDOWN://让无边框窗口能够拖动(在窗口客户区拖动)PostMessage(hwnd, WM_SYSCOMMAND, 61458, 0);break;default:break;}return DefWindowProc(hwnd, uMsg, wParam, lParam);//其他消息交给系统处理}

（2）源码：

#include "stdafx.h"#include <gdiplus.h>#include <gdiplusflat.h>#pragma comment(lib,"gdiplus.lib")//very important#include <windows.h>#include <windowsx.h>#pragma comment(lib,"user32.lib")#pragma comment(lib,"gdi32.lib")#pragma comment(lib,"Msimg32.lib")//GDI+Flat#define ARGB(a,r,g,b) ((int)(((BYTE)a)<<24)|(((BYTE)r)<<16)|(((BYTE)g)<<8)|((BYTE)b))typedef struct _GdiplusStartupInput{unsigned int GdiplusVersion;unsigned int DebugEventCallback;BOOL SuppressBackgroundThread;BOOL SuppressExternalCodecs;}GdiplusStartupInput;extern "C" int WINAPI GdiplusStartup(int* token, GdiplusStartupInput *input, int *output);extern "C" void WINAPI GdiplusShutdown(int token);extern "C" int WINAPI GdipCreateFromHDC(HDC hdc, int* graphics);extern "C" int WINAPI GdipDeleteGraphics(int graphics);//画笔extern "C" int WINAPI GdipCreatePen1(unsigned int argb_color, float width, int unit, int** pen);extern "C" int WINAPI GdipDeletePen(int* pen);//画矩形 画直线extern "C" int WINAPI GdipDrawRectangle(int graphics, int* pen, float x, float y, float width, float height);extern "C" int WINAPI GdipDrawLine(int graphics, int* pen, float x1, float y1, float x2, float y2);//画刷typedef struct _PointF{float x;float y;}PointF;extern "C" int WINAPI GdipCreateSolidFill(unsigned int argb_color, int** brush);extern "C" int WINAPI GdipCreateLineBrush(PointF* point1, PointF* point2, unsigned int argb_color1, unsigned int argb_color2, int wrapMode, int** lineGradient);extern "C" int WINAPI GdipDeleteBrush(int* brush);//画填充矩形extern "C" int WINAPI GdipFillRectangle(int graphics, int* brush, float x, float y, float width, float height);//画图片extern "C" int WINAPI GdipLoadImageFromFile(WCHAR* filename, int** image);extern "C" int WINAPI GdipLoadImageFromStream(LPSTREAM stream, int** image);extern "C" int WINAPI GdipGetImageDimension(int* image, float* width, float* height);extern "C" int WINAPI GdipDrawImageRect(int graphics, int* image, float x, float y, float width, float height);extern "C" int WINAPI GdipDisposeImage(int* image);//画文字typedef struct _RectF{float x;float y;float Width;float Height;}RectF;extern "C" int WINAPI GdipSetTextRenderingHint(int graphics, int mode);extern "C" int WINAPI GdipSetSmoothingMode(int graphics, int smoothingMode);extern "C" int WINAPI GdipCreateFontFamilyFromName(WCHAR* name, int* fontCollection, int** fontFamily);extern "C" int WINAPI GdipCreateStringFormat(int formatAttributes, short language, int** format);extern "C" int WINAPI GdipSetStringFormatAlign(int* format, int align);extern "C" int WINAPI GdipSetStringFormatLineAlign(int* format, int align);extern "C" int WINAPI GdipCreateFont(int* fontFamily, float emSize, int style, int unit, int** font);extern "C" int WINAPI GdipDrawString(int graphics, WCHAR* string, int length, int* font, RectF* layoutRect, int* stringFormat, int* brush);extern "C" int WINAPI GdipDeleteFont(int* font);extern "C" int WINAPI GdipDeleteStringFormat(int* format);extern "C" int WINAPI GdipDeleteFontFamily(int* fontFamily);int token;int* pen;int* brush;int* linebrush;int* image;//HDC mdc;//*************************************************************LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);WNDCLASS wc;const TCHAR* AppName = TEXT("MyWindowClass1");HWND hwnd1;BOOL Track;WNDPROC lastproc;HWND edit;int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,_In_opt_ HINSTANCE hPrevInstance,_In_ LPTSTR    lpCmdLine,_In_ int       nCmdShow){//GDI+开启GdiplusStartupInput StartupInput = { 0 };StartupInput.GdiplusVersion = 1;if (GdiplusStartup(&token, &StartupInput, NULL))MessageBox(0, TEXT("GdiPlus开启失败"), TEXT("错误"), MB_ICONERROR);//这里是在构建窗口类结构wc.style = CS_HREDRAW | CS_VREDRAW;wc.lpfnWndProc = WndProc;//窗口回调函数指针wc.cbClsExtra = 0;wc.cbWndExtra = 0;wc.hInstance = hInstance;//实例句柄wc.hIcon = LoadIcon(hInstance, TEXT("ICON_1"));wc.hCursor = LoadCursor(NULL, IDC_ARROW);//默认指针wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);wc.lpszMenuName = NULL;wc.lpszClassName = AppName;//窗口类名//注册窗口类if (!RegisterClass(&wc)){MessageBox(NULL, TEXT("注册窗口类失败!"), TEXT("错误"), MB_ICONERROR);return 0;}//创建窗口int style = WS_OVERLAPPEDWINDOW;hwnd1 = CreateWindowEx(NULL, AppName, TEXT("窗口标题"), style, 50, 50, 500, 500, 0, LoadMenu(hInstance, TEXT("MENU1")), hInstance, 0);if (hwnd1 == NULL){MessageBox(NULL, TEXT("创建窗口失败!"), TEXT("错误"), MB_ICONERROR);return 0;}//无边框窗口SetWindowLong(hwnd1, GWL_STYLE, WS_OVERLAPPED | WS_VISIBLE | WS_CLIPCHILDREN | WS_CLIPSIBLINGS);//显示、更新窗口ShowWindow(hwnd1, nCmdShow);UpdateWindow(hwnd1);//消息循环MSG msg;while (GetMessage(&msg, NULL, 0, 0)){TranslateMessage(&msg);DispatchMessage(&msg);}//GDI+关闭GdiplusShutdown(token);//可以把这个写在消息循环后面，程序退出就销毁，或者在不需要GDI+时调用，比如GDI+窗口的WM_DESTROY消息里调用return msg.wParam;}void WINAPI draw(HDC hdc, unsigned int argb){int graphics;GdipCreateFromHDC(hdc, &graphics);//创建Graphics对象GdipCreatePen1(argb, 3, 2, &pen);//创建画笔GdipDrawRectangle(graphics, pen, 0, 0, 120, 20);//画矩形GdipDeletePen(pen);//销毁画笔}LRESULT CALLBACK Proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam){int xPos, yPos;switch (uMsg){case WM_NCPAINT:HDC hdc;hdc = GetWindowDC(hwnd);//获取完整窗口（包括非客户区）DC句柄draw(hdc, ARGB(255, 79, 202, 255));ReleaseDC(hwnd, hdc);return 0;break;case WM_SETFOCUS://获取焦点hdc = GetWindowDC(hwnd);//获取完整窗口（包括非客户区）DC句柄draw(hdc, ARGB(255, 163, 73, 164));ReleaseDC(hwnd, hdc);break;case WM_KILLFOCUS://失去焦点hdc = GetWindowDC(hwnd);//获取完整窗口（包括非客户区）DC句柄draw(hdc, ARGB(255, 79, 202, 255));ReleaseDC(hwnd, hdc);break;}return CallWindowProc(lastproc, hwnd, uMsg, wParam, lParam);//让原来的窗口回调函数处理其他消息}LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam){switch (uMsg){case WM_CREATE://mdc = CreateCompatibleDC(0);//BITMAPINFO bitmapinfo;//RtlZeroMemory(&bitmapinfo, sizeof(BITMAPINFO));//bitmapinfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);//bitmapinfo.bmiHeader.biWidth = 120;//bitmapinfo.bmiHeader.biHeight = 25;//bitmapinfo.bmiHeader.biPlanes = 1;//bitmapinfo.bmiHeader.biBitCount = 32;//HBITMAP b, old;//b = CreateDIBSection(0, &bitmapinfo, 0, 0, 0, 0);//old = (HBITMAP)SelectObject(mdc, b);//if (old != NULL){//DeleteObject(old);//}//DeleteObject(b);edit = CreateWindowEx(WS_EX_CLIENTEDGE, TEXT("Edit"), TEXT("Edit Control"), WS_CHILD | WS_VISIBLE | ES_LEFT | ES_AUTOHSCROLL | ES_MULTILINE, 20, 20, 121, 21, hwnd, (HMENU)1, (HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE), NULL);SendMessage(edit, WM_SETFONT, (WPARAM)GetStockObject(17), 0);lastproc = (WNDPROC)SetWindowLongPtr(edit, GWL_WNDPROC, (LONG)&Proc);TEXTMETRIC tm;GetTextMetrics(GetDC(edit), &tm);//获取字体信息RECT rect;GetClientRect(edit, &rect);//获取edit矩形OffsetRect(&rect, 0, (21 - tm.tmHeight) / 2);//移动矩形rect.bottom = rect.top + tm.tmHeight;//设置RECT的底边坐标SendMessage(edit, EM_SETRECT, 0, (LPARAM)&rect);//设置矩形edit = CreateWindowEx(WS_EX_CLIENTEDGE, TEXT("Edit"), TEXT("Edit Control"), WS_CHILD | WS_VISIBLE | ES_LEFT | ES_AUTOHSCROLL | ES_MULTILINE, 20, 60, 121, 21, hwnd, (HMENU)2, (HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE), NULL);SendMessage(edit, WM_SETFONT, (WPARAM)GetStockObject(17), 0);return 0;break;case WM_DESTROY://窗口已经销毁DeleteDC(mdc);PostQuitMessage(0);//退出消息循环，结束应用程序return 0;break;case WM_LBUTTONDOWN://让无边框窗口能够拖动(在窗口客户区拖动)PostMessage(hwnd, WM_SYSCOMMAND, 61458, 0);break;default:break;}return DefWindowProc(hwnd, uMsg, wParam, lParam);//其他消息交给系统处理}