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
}