用点击改变字体的颜色
我使用的是win32 API,这是我的代码(我已经从这个网站获得了一些帮助;))。用点击改变字体的颜色
LRESULT CALLBACK WndProc (HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
RECT size;
int width;
char * widthHeight;
static char Swidth[32];
static char Sheight[32];
int height;
char sBottom[32];
char sTop[32];
char sLeft[32];
char sRight[32];
char SrightButtonClicked[32];
static int rightButtonClicked = 0;
char SleftButtonClicked[32];
static int leftButtonClicked = 0;
static bool LeftButtonClicked = false;
static bool RightButtonClicked = false;
switch (message)
{
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps);
if(LeftButtonClicked == true)
{
SetDCPenColor(hdc, RGB(0, 0, 255));
LeftButtonClicked = false;
}
if(RightButtonClicked == true)
{
SetDCPenColor(hdc, RGB(255, 0, 0));
RightButtonClicked = false;
}
GetClientRect (hwnd, &rect);
GetWindowRect(hwnd, &size);
//Variables used in outputting.
width = size.right - size.left;
itoa(width, Swidth, 10);
height = size.bottom - size.top;
itoa(height, Sheight, 10);
itoa(rect.bottom, sBottom, 10);
itoa(rect.top, sTop, 10);
itoa(rect.left, sLeft, 10);
itoa(rect.right, sRight, 10);
//Line 1, Width and height output
TextOut(hdc, 0, 0, "Here is my width: ", 18);
TextOut(hdc, 125, 0, Swidth, 5);
TextOut(hdc, 175, 0, "Here is my height: ", 18);
TextOut(hdc, 300, 0, Sheight, 4);
//Line 2, Output the bottom, right, left, and top of the window
TextOut(hdc, 0, 20, sBottom, strlen(sBottom));
TextOut(hdc, 50, 20, sTop, strlen(sTop));
TextOut(hdc, 100, 20, sRight, strlen(sRight));
TextOut(hdc, 150, 20, sLeft, strlen(sLeft));
//Outputs the number of times right click has been clicked
TextOut(hdc, 0, 40, "Right Button Clicked: ", 23);
itoa(rightButtonClicked, SrightButtonClicked, 10);
TextOut(hdc, 150, 40, SrightButtonClicked, strlen(SrightButtonClicked));
//Output the number of times left click has been clicked
TextOut(hdc, 0, 60, "Left Button Clicked: ", 22);
itoa(leftButtonClicked, SleftButtonClicked, 10);
TextOut(hdc, 150, 60, SleftButtonClicked, strlen(SleftButtonClicked));
EndPaint (hwnd, &ps);
return 0;
case WM_LBUTTONDOWN:
leftButtonClicked++;
LeftButtonClicked = true;
InvalidateRect(hwnd, 0, true);
return 0;
case WM_RBUTTONDOWN:
rightButtonClicked++;
RightButtonClicked = true;
//Uses char * widthHeight to concat all the resolution into one char to output in Messagebox
widthHeight = new char[strlen(Swidth) + strlen(Sheight) + 4];
widthHeight = Swidth;
strcat(widthHeight, " x ");
strcat(widthHeight, Sheight);
//Has a message box pop up with resolution of window in Mouse Button OK format
MessageBox(NULL, widthHeight , "Right Mouse Button Pressed!", MB_OK);
InvalidateRect(hwnd, 0, true);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc (hwnd, message, wParam, lParam);
}
现在我想让它做点改变文字的颜色,当我点击一个颜色的时候..说红色?当我点击右键时,它会转到蓝色。我该如何去做这件事?我搜索了很多,一切似乎都非常复杂。
试试这个(后您调用BeginPaint()调用将工作)开始输出前:
// Set the Pen to Blue
SetDCPenColor(hdc, RGB(0,0,255));
做你是想只设置在你的鼠标下的处理程序,您在您的油漆检查的值处理程序。如果未设置[RGB(0,0,0)],则使用黑色,并且如果设置为使用蓝色[RGB(0,0,255)]。
编辑:也不要使用静态hdc。每个人都想这样做,但它不起作用。 HDC实际上由操作系统维护,因此C++将无法跟踪它。最终这是一个保证失败。在使用之前,总是得到一个新的hdc(或者任何名为DC的东西)。
编辑2:试试这个......
LRESULT CALLBACK WndProc (HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
RECT size;
int width;
char * widthHeight;
static char Swidth[32];
static char Sheight[32];
int height;
char sBottom[32];
char sTop[32];
char sLeft[32];
char sRight[32];
char SrightButtonClicked[32];
static int rightButtonClicked = 0;
char SleftButtonClicked[32];
static int leftButtonClicked = 0;
static bool LeftButtonClicked = false;
static bool RightButtonClicked = false;
static COLORREF pencolor = RGB(0,0,0); // Added by KRowe
switch (message)
{
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps);
SetDCPenColor(hdc, pencolor); // Added by KRowe
GetClientRect (hwnd, &rect);
GetWindowRect(hwnd, &size);
//Variables used in outputting.
width = size.right - size.left;
itoa(width, Swidth, 10);
height = size.bottom - size.top;
itoa(height, Sheight, 10);
itoa(rect.bottom, sBottom, 10);
itoa(rect.top, sTop, 10);
itoa(rect.left, sLeft, 10);
itoa(rect.right, sRight, 10);
//Line 1, Width and height output
TextOut(hdc, 0, 0, "Here is my width: ", 18);
TextOut(hdc, 125, 0, Swidth, 5);
TextOut(hdc, 175, 0, "Here is my height: ", 18);
TextOut(hdc, 300, 0, Sheight, 4);
//Line 2, Output the bottom, right, left, and top of the window
TextOut(hdc, 0, 20, sBottom, strlen(sBottom));
TextOut(hdc, 50, 20, sTop, strlen(sTop));
TextOut(hdc, 100, 20, sRight, strlen(sRight));
TextOut(hdc, 150, 20, sLeft, strlen(sLeft));
//Outputs the number of times right click has been clicked
TextOut(hdc, 0, 40, "Right Button Clicked: ", 23);
itoa(rightButtonClicked, SrightButtonClicked, 10);
TextOut(hdc, 150, 40, SrightButtonClicked, strlen(SrightButtonClicked));
//Output the number of times left click has been clicked
TextOut(hdc, 0, 60, "Left Button Clicked: ", 22);
itoa(leftButtonClicked, SleftButtonClicked, 10);
TextOut(hdc, 150, 60, SleftButtonClicked, strlen(SleftButtonClicked));
EndPaint (hwnd, &ps);
return 0;
case WM_LBUTTONDOWN:
leftButtonClicked++;
LeftButtonClicked = true;
pencolor = RGB(255,0,0); // Added by KRowe
InvalidateRect(hwnd, 0, true);
return 0;
case WM_RBUTTONDOWN:
rightButtonClicked++;
RightButtonClicked = true;
pencolor = RGB(0, 255,0); // Added by KRowe
widthHeight = new char[strlen(Swidth) + strlen(Sheight) + 4];
widthHeight = Swidth;
strcat(widthHeight, " x ");
strcat(widthHeight, Sheight);
//Has a message box pop up with resolution of window in Mouse Button OK format
MessageBox(NULL, widthHeight , "Right Mouse Button Pressed!", MB_OK);
InvalidateRect(hwnd, 0, true);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc (hwnd, message, wParam, lParam);
}
没有运气。我必须让我的hdc变量为静态,以使其不会中断,但它仍然不会将文本变成蓝色。 – 2013-04-08 18:02:08
纠正我,如果我错了,但我认为hdc只能通过设置它等于BeginPaint和开始和结束油漆仅用于WM_PAINT ..所以我怎么会得到一个新的hdc在我的case语句?在那里做一个BeginPaint和EndPaint? – 2013-04-08 18:10:37
我编辑我以前的帖子,包括我的新代码,不工作.. :( – 2013-04-08 18:16:29
请阅读[MSDN文章(http://msdn.microsoft.com/en-us/library/windows/desktop/dd145133(V = vs.85).aspx)为TextOut,它显示了它使用什么颜色来呈现文本。链接到改变这些颜色的winapi函数在文章的底部。 Petzold的Programming Windows也是这种基本信息的极好来源。 – 2013-04-08 18:13:12
谢谢=)。这工作。我没有意识到这很简单! – 2013-04-08 18:18:06