GdiplusFlat（9）自绘按钮的实现（方法2）

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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来绘制按钮的方法1。

这一篇博文中，我们来聊聊如何用GdiplusFlat来绘制按钮的方法2。

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。~~

在上一篇中我们已经知道了，自绘按钮有两种形式，这两种形式分别是：

1。我们不创建按钮，我们直接在窗口的设备上下文场景的一部分上绘制按钮，也就是说不存在一个子窗口，按钮完全是我们自己画上去的。

2。将一个标准的win32按钮子类化（子类化介绍），在按钮的WM_PAINT、WM_MOUSEMOVE、WM_MOUSELEAVE、WM_LBUTTONDOWN、WM_LBUTTONUP消息里面控制按钮的绘制，也就是说，我们直接基于一个Win32按钮，我们是改变了这个win32按钮的实现逻辑，绘制成我们需要的样式，按钮依旧作为子窗口存在。

上一篇讲了方法1，这一篇文章讲一讲方法2

上一篇地址：/article/9672527.html

效果和上一篇中的一样，但方法略有不同，这种方法不需要判断鼠标指针位置，但需要对按钮子类化。

关于子类化的：/article/9672521.html

效果图：（和上一篇一样）（GIF本身的限制，动画有颜色失真）



完整源码

#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;

void WINAPI MyDrawText(HDC hdc, LPCTSTR str, LONG left, LONG top, LONG width, LONG height, BOOL iscenter, COLORREF color = 0){
SetBkMode(hdc, TRANSPARENT);
RECT r = { left, top, left + width, top + height };
HFONT hFont = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
HFONT hOldFont = (HFONT)SelectObject(hdc, hFont);
SetTextColor(hdc, color);
DrawText(hdc, str, -1, &r, iscenter ? DT_CENTER | DT_VCENTER | DT_SINGLELINE : 0);
SelectObject(hdc, hOldFont);
DeleteObject(hFont);
}//参数：设备上下文句柄，要绘制的字符串，x位置，y位置，宽度，高度，是否绘制在矩形中央，颜色

//*************************************************************
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 button;

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;

}

//参数：设备上下文句柄；按钮背景ARGB颜色
void WINAPI drawbutton(HDC hdc, unsigned int argb){
int graphics;
GdipCreateFromHDC(mdc, &graphics);//创建Graphics对象

GdipCreateSolidFill(0xFFFFFFFF, &brush);
GdipFillRectangle(graphics, brush, 0, 0, 500, 500);
GdipDeleteBrush(brush);//将内存DC背景涂白

GdipCreateSolidFill(argb, &brush);//创建单色画刷
GdipFillRectangle(graphics, brush, 0, 0, 120, 25);//用单色画刷填充矩形
GdipDeleteBrush(brush);//销毁画刷

GdipCreatePen1(ARGB(255, 185, 206, 230), 1, 2, &pen);//创建画笔
GdipDrawRectangle(graphics, pen, 0, 0, 119, 24);//画矩形
GdipDeletePen(pen);//销毁画笔

MyDrawText(mdc, TEXT("按钮"), 0, 0, 120, 26, true);

StretchBlt(hdc, 0, 0, 120, 25, mdc, 0, 0, 120, 25, SRCCOPY);//DC复制
GdipDeleteGraphics(graphics);//销毁Graphics对象
}

LRESULT CALLBACK ButtonProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
int xPos, yPos;
switch (uMsg){
case WM_PAINT:
HDC hdc;
PAINTSTRUCT ps;
hdc = BeginPaint(hwnd, &ps);
drawbutton(hdc, ARGB(255, 240, 240, 240));
EndPaint(hwnd, &ps);
return 0;//告诉系统，WM_PAINT消息我已经处理了，你那儿凉快哪儿玩去吧。
break;
case WM_MOUSEMOVE://鼠标移动
xPos = GET_X_LPARAM(lParam);//鼠标位置X坐标
yPos = GET_Y_LPARAM(lParam);//鼠标位置Y坐标//不要用LOWORD和HIWORD获取坐标，因为坐标有可能是负的

if (Track == false){
TRACKMOUSEEVENT a;
a.cbSize = sizeof(TRACKMOUSEEVENT);
a.dwFlags = TME_LEAVE;
a.hwndTrack = hwnd;
if (TrackMouseEvent(&a) != 0){
Track == true;
}
}

hdc = GetDC(hwnd);
drawbutton(hdc, ARGB(255, 64, 198, 255));
return 0;
break;
case WM_MOUSELEAVE:
Track = false;
if (1){
hdc = GetDC(hwnd);
drawbutton(hdc, ARGB(255, 240, 240, 240));
}
return 0;
break;
case WM_LBUTTONDOWN:
xPos = GET_X_LPARAM(lParam);
yPos = GET_Y_LPARAM(lParam);
hdc = GetDC(hwnd);
drawbutton(hdc, ARGB(50, 255, 0, 0));
SetCapture(hwnd);//捕获鼠标
return 0;
break;
case WM_LBUTTONUP:

hdc = GetDC(hwnd);
drawbutton(hdc, ARGB(255, 240, 240, 240));

xPos = GET_X_LPARAM(lParam);
yPos = GET_Y_LPARAM(lParam);

//在这里添加按钮单击的事件
MessageBox(NULL, TEXT("你按下了按钮"), TEXT("自绘按钮"), MB_ICONINFORMATION);

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);

button = CreateWindow(TEXT("Button"), NULL, WS_CHILD | WS_VISIBLE|BS_PUSHBOX|BS_OWNERDRAW, 20, 20, 120, 25, hwnd, (HMENU)5, (HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE), NULL);
lastproc = (WNDPROC)SetWindowLongPtr(button, GWL_WNDPROC, (LONG)&ButtonProc);//创建win32按钮控件并子类化

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
}