本文介绍了如何更改按钮 WinAPI C++ 的背景颜色的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
我已经搜索了很多次，但我找到的一切都是 MFC.我想要它在 C++ WinAPI 中.我知道如何更改按钮控件的样式，但我不知道如何使按钮具有不同的颜色.那么，如何使用 C++ 更改 WinAPI 按钮控件的背景颜色?我不想用资源文件来做这件事.
I have searched this many times, but everything I find is MFC. I want it in C++ WinAPI. I know how to change the style of a button control, but I cannot find out how to make a button a different color. So, how can I change the background color of a WinAPI button control using C++? I don't want to do this with a resource file.
谢谢！
推荐答案
我将使用自定义绘图从我的其他帖子中发布一个副本，而不是链接，类似于 alwayslearningnewstuff 示例:
Instead of a link I'll just post a copy from my other post using custom-drawing, similar to alwayslearningnewstuff example:
第一张图显示什么都没有选择，第二张图显示第一个按钮被选中并被按下，最后一张图显示第二个按钮被按下并且鼠标悬停在上面(注意亮度的增加 - cutom hilight).为此，您必须自己捕获 NM_CUSTOMDRAW 消息并绘制按钮.这就是你如何做到的.还增加了渐变刷功能和一些注释.
First picture shows when nothing is selected, second shows when first button is selected and was pushed and the last one shows when second button was pushed and the mouse is over it (notice the increase of brightness - cutom hilight). In order to do this, you must catch NM_CUSTOMDRAW message and paint button yourself. And this is how you do it. Also added gradient brush function and some comments.
#pragma comment(linker,""/manifestdependency:type='win32'
name='Microsoft.Windows.Common-Controls' version='6.0.0.0'
processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'"")
#include <Windows.h>
#include <Commctrl.h>
#define IDC_EXIT_BUTTON 101
#define IDC_PUSHLIKE_BUTTON 102
HBRUSH CreateGradientBrush(COLORREF top, COLORREF bottom, LPNMCUSTOMDRAW item)
{
HBRUSH Brush = NULL;
HDC hdcmem = CreateCompatibleDC(item->hdc);
HBITMAP hbitmap = CreateCompatibleBitmap(item->hdc, item->rc.right-item->rc.left, item->rc.bottom-item->rc.top);
SelectObject(hdcmem, hbitmap);
int r1 = GetRValue(top), r2 = GetRValue(bottom), g1 = GetGValue(top), g2 = GetGValue(bottom), b1 = GetBValue(top), b2 = GetBValue(bottom);
for(int i = 0; i < item->rc.bottom-item->rc.top; i++)
{
RECT temp;
int r,g,b;
r = int(r1 + double(i * (r2-r1) / item->rc.bottom-item->rc.top));
g = int(g1 + double(i * (g2-g1) / item->rc.bottom-item->rc.top));
b = int(b1 + double(i * (b2-b1) / item->rc.bottom-item->rc.top));
Brush = CreateSolidBrush(RGB(r, g, b));
temp.left = 0;
temp.top = i;
temp.right = item->rc.right-item->rc.left;
temp.bottom = i + 1;
FillRect(hdcmem, &temp, Brush);
DeleteObject(Brush);
}
HBRUSH pattern = CreatePatternBrush(hbitmap);
DeleteDC(hdcmem);
DeleteObject(Brush);
DeleteObject(hbitmap);
return pattern;
}
LRESULT CALLBACK MainWindow(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
static HBRUSH defaultbrush = NULL;
static HBRUSH hotbrush = NULL;
static HBRUSH selectbrush = NULL;
static HBRUSH push_uncheckedbrush = NULL;
static HBRUSH push_checkedbrush = NULL;
static HBRUSH push_hotbrush1 = NULL;
static HBRUSH push_hotbrush2 = NULL;
switch (msg)
{
case WM_CREATE:
{
HWND Exit_Button = CreateWindowEx(NULL, L"BUTTON", L"EXIT",
WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON,
50, 50, 100, 100, hwnd, (HMENU)IDC_EXIT_BUTTON, NULL, NULL);
if(Exit_Button == NULL)
{
MessageBox(NULL, L"Button Creation Failed!", L"Error!", MB_ICONEXCLAMATION);
exit(EXIT_FAILURE);
}
HWND Pushlike_Button = CreateWindowEx(NULL, L"BUTTON", L"PUSH ME!",
WS_VISIBLE | WS_CHILD | BS_AUTOCHECKBOX | BS_PUSHLIKE,
200, 50, 100, 100, hwnd, (HMENU)IDC_PUSHLIKE_BUTTON, NULL, NULL);
if(Pushlike_Button == NULL)
{
MessageBox(NULL, L"Button Creation Failed!", L"Error!", MB_ICONEXCLAMATION);
exit(EXIT_FAILURE);
}
}
break;
case WM_COMMAND:
{
switch(LOWORD(wParam))
{
case IDC_EXIT_BUTTON:
{
SendMessage(hwnd, WM_CLOSE, 0, 0);
}
break;
}
}
break;
case WM_NOTIFY:
{
LPNMHDR some_item = (LPNMHDR)lParam;
if (some_item->idFrom == IDC_EXIT_BUTTON && some_item->code == NM_CUSTOMDRAW)
{
LPNMCUSTOMDRAW item = (LPNMCUSTOMDRAW)some_item;
if (item->uItemState & CDIS_SELECTED)
{
//Select our color when the button is selected
if (selectbrush == NULL)
selectbrush = CreateGradientBrush(RGB(180, 0, 0), RGB(255, 180, 0), item);
//Create pen for button border
HPEN pen = CreatePen(PS_INSIDEFRAME, 0, RGB(0, 0, 0));
//Select our brush into hDC
HGDIOBJ old_pen = SelectObject(item->hdc, pen);
HGDIOBJ old_brush = SelectObject(item->hdc, selectbrush);
//If you want rounded button, then use this, otherwise use FillRect().
RoundRect(item->hdc, item->rc.left, item->rc.top, item->rc.right, item->rc.bottom, 5, 5);
//Clean up
SelectObject(item->hdc, old_pen);
SelectObject(item->hdc, old_brush);
DeleteObject(pen);
//Now, I don't want to do anything else myself (draw text) so I use this value for return:
return CDRF_DODEFAULT;
//Let's say I wanted to draw text and stuff, then I would have to do it before return with
//DrawText() or other function and return CDRF_SKIPDEFAULT
}
else
{
if (item->uItemState & CDIS_HOT) //Our mouse is over the button
{
//Select our color when the mouse hovers our button
if (hotbrush == NULL)
hotbrush = CreateGradientBrush(RGB(255, 230, 0), RGB(245, 0, 0), item);
HPEN pen = CreatePen(PS_INSIDEFRAME, 0, RGB(0, 0, 0));
HGDIOBJ old_pen = SelectObject(item->hdc, pen);
HGDIOBJ old_brush = SelectObject(item->hdc, hotbrush);
RoundRect(item->hdc, item->rc.left, item->rc.top, item->rc.right, item->rc.bottom, 5, 5);
SelectObject(item->hdc, old_pen);
SelectObject(item->hdc, old_brush);
DeleteObject(pen);
return CDRF_DODEFAULT;
}
//Select our color when our button is doing nothing
if (defaultbrush == NULL)
defaultbrush = CreateGradientBrush(RGB(255, 180, 0), RGB(180, 0, 0), item);
HPEN pen = CreatePen(PS_INSIDEFRAME, 0, RGB(0, 0, 0));
HGDIOBJ old_pen = SelectObject(item->hdc, pen);
HGDIOBJ old_brush = SelectObject(item->hdc, defaultbrush);
RoundRect(item->hdc, item->rc.left, item->rc.top, item->rc.right, item->rc.bottom, 5, 5);
SelectObject(item->hdc, old_pen);
SelectObject(item->hdc, old_brush);
DeleteObject(pen);
return CDRF_DODEFAULT;
}
}
else if (some_item->idFrom == IDC_PUSHLIKE_BUTTON && some_item->code == NM_CUSTOMDRAW)
{
LPNMCUSTOMDRAW item = (LPNMCUSTOMDRAW)some_item;
if (IsDlgButtonChecked(hwnd, some_item->idFrom))
{
if (item->uItemState & CDIS_HOT)
{
if (push_hotbrush1 == NULL)
push_hotbrush1 = CreateGradientBrush(RGB(0, 0, 245), RGB(0, 230, 255), item);
HPEN pen = CreatePen(PS_INSIDEFRAME, 0, RGB(0, 0, 0));
HGDIOBJ old_pen = SelectObject(item->hdc, pen);
HGDIOBJ old_brush = SelectObject(item->hdc, push_hotbrush1);
RoundRect(item->hdc, item->rc.left, item->rc.top, item->rc.right, item->rc.bottom, 10, 10);
SelectObject(item->hdc, old_pen);
SelectObject(item->hdc, old_brush);
DeleteObject(pen);
return CDRF_DODEFAULT;
}
if (push_checkedbrush == NULL)
push_checkedbrush = CreateGradientBrush(RGB(0, 0, 180), RGB(0, 222, 200), item);
HPEN pen = CreatePen(PS_INSIDEFRAME, 0, RGB(0, 0, 0));
HGDIOBJ old_pen = SelectObject(item->hdc, pen);
HGDIOBJ old_brush = SelectObject(item->hdc, push_checkedbrush);
RoundRect(item->hdc, item->rc.left, item->rc.top, item->rc.right, item->rc.bottom, 10, 10);
SelectObject(item->hdc, old_pen);
SelectObject(item->hdc, old_brush);
DeleteObject(pen);
return CDRF_DODEFAULT;
}
else
{
if (item->uItemState & CDIS_HOT)
{
if (push_hotbrush2 == NULL)
push_hotbrush2 = CreateGradientBrush(RGB(255, 230, 0), RGB(245, 0, 0), item);
HPEN pen = CreatePen(PS_INSIDEFRAME, 0, RGB(0, 0, 0));
HGDIOBJ old_pen = SelectObject(item->hdc, pen);
HGDIOBJ old_brush = SelectObject(item->hdc, push_hotbrush2);
RoundRect(item->hdc, item->rc.left, item->rc.top, item->rc.right, item->rc.bottom, 10, 10);
SelectObject(item->hdc, old_pen);
SelectObject(item->hdc, old_brush);
DeleteObject(pen);
return CDRF_DODEFAULT;
}
if (push_uncheckedbrush == NULL)
push_uncheckedbrush = CreateGradientBrush(RGB(255, 180, 0), RGB(180, 0, 0), item);
HPEN pen = CreatePen(PS_INSIDEFRAME, 0, RGB(0, 0, 0));
HGDIOBJ old_pen = SelectObject(item->hdc, pen);
HGDIOBJ old_brush = SelectObject(item->hdc, defaultbrush);
RoundRect(item->hdc, item->rc.left, item->rc.top, item->rc.right, item->rc.bottom, 10, 10);
SelectObject(item->hdc, old_pen);
SelectObject(item->hdc, old_brush);
DeleteObject(pen);
return CDRF_DODEFAULT;
}
}
return CDRF_DODEFAULT;
}
break;
case WM_CTLCOLORBTN: //In order to make those edges invisble when we use RoundRect(),
{ //we make the color of our button's background match window's background
return (LRESULT)GetSysColorBrush(COLOR_WINDOW+1);
}
break;
case WM_CLOSE:
{
DestroyWindow(hwnd);
return 0;
}
break;
case WM_DESTROY:
{
DeleteObject(defaultbrush);
DeleteObject(selectbrush);
DeleteObject(hotbrush);
DeleteObject(push_checkedbrush);
DeleteObject(push_hotbrush1);
DeleteObject(push_hotbrush2);
DeleteObject(push_uncheckedbrush);
PostQuitMessage(0);
return 0;
}
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
HWND hwnd;
MSG msg;
const wchar_t ClassName[] = L"Main_Window";
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = MainWindow;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = GetSysColorBrush(COLOR_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = ClassName;
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&wc))
{
MessageBox(NULL, L"Window Registration Failed!", L"Error", MB_ICONEXCLAMATION | MB_OK);
exit(EXIT_FAILURE);
}
hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, ClassName, L"Window", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 368, 248, NULL, NULL, hInstance, NULL);
if(hwnd == NULL)
{
MessageBox(NULL, L"Window Creation Failed!", L"Error!", MB_ICONEXCLAMATION | MB_OK);
exit(EXIT_FAILURE);
}
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&msg, NULL, 0, 0) > 0)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.message;
}
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