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現在我試圖找到解決方案「per-apllication cleartype fonts」問題。渲染系統控制字體以外的字體
我想實現TextBox或Button或ComboBox或任何其他非自定義/庫存控件的明文字體。
好，有一個簡單的方法來實現這一目標，我知道的，那就是，重寫OnPaint方法：
protected override void OnPaint(PaintEventArgs pevent)
{
pevent.Graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
base.OnPaint(pevent);
}
，這工作得很好，但事情是，我想這樣做而不會繼承這些控件，並以某種方式從類外改變字體屬性。
我迄今爲止使用的方法並沒有取得太大的成功，而是安裝了'Hook Procedure'並偵聽發送到控件的消息。代碼波紋管是Form1 class的一部分：
// the delegate with the same signature as the callback function
private delegate int HookMessages(int nCode, IntPtr wParam, IntPtr lParam);
// when the Load event of the Form takes place the controls are created
// and the method that sets the hooks is called
private void Form1_Load(object sender, EventArgs e)
{
Button btn = new Button();
btn.Name = "btn";
btn.Parent = this;
btn.Size = new Size(this.ClientRectangle.Width - 10, 20);
btn.Location = new Point(5, tbx.Top + tbx.Height + 10);
btn.BackColor = Color.FromArgb(100, 1, 1, 1);
btn.Text = "Click ME";
HookControlMessages();
}
// the hook that monitors control's events is set for the current thread
private void HookControlMessages()
{
if (hookWndHandle == 0)
{
HookWndProcedure = new HookMessages(HookWndProcMessages);
hookWndHandle = SetWindowsHookEx(
WindowHookTypes.WH_CALLWNDPROC,
HookWndProcedure,
IntPtr.Zero,
(int)GetCurrentThreadId());
if (hookWndHandle == 0)
{
MessageBox.Show("Window`s messages hooking failed.");
return;
}
}
}
// the callback function
private static int HookWndProcMessages(int nCode, IntPtr wParam, IntPtr lParam)
{
int nextHook = 0;
try
{
if (nCode >= 0)
{
CWPSTRUCT m = (CWPSTRUCT)Marshal.PtrToStructure(lParam, typeof(CWPSTRUCT));
_thisInstance.CheckWndProcMsgs(m);
}
nextHook = CallNextHookEx(hookWndHandle, nCode, wParam, lParam);
}
catch
{
nextHook = 0;
}
return nextHook;
}
private void CheckWndProcMsgs(CWPSTRUCT m)
{
if (m.hwnd == ((this.Controls.Find("btn", true) as Control[])[0] as Button).Handle)
{
#region BUTTON
switch (m.message)
{
case (int)WindowsMessages.WM_CREATE:
{
// when the handle of the control is created also a new font is created
// and a WM_SETFONT message sent along with the specification that a redraw must be performed
Rect rc = new Rect(new Rectangle(0, 0, ((this.Controls.Find("btn", true) as Control[])[0] as UButton).Width, ((this.Controls.Find("btn", true) as Control[])[0] as UButton).Height));
hFontNew = CreateFont(
25, 5, 2, 0, 900, 0, 0, 0,
(byte)FontCharSet.OEM_CHARSET,
(byte)FontPrecision.OUT_DEFAULT_PRECIS,
(byte)FontClipPrecision.CLIP_DEFAULT_PRECIS,
(byte)FontQuality.DEFAULT_QUALITY,
(byte)(FontPitchAndFamily.DEFAULT_PITCH | FontPitchAndFamily.FF_DONTCARE),
"Verdana");
SendMessage(m.hwnd, (uint)WindowsMessages.WM_SETFONT, hFontNew, (IntPtr)1);
}
break;
case (int)WindowsMessages.WM_SETFONT:
{
// the purpose of this block is to verify if the new font is set correct
LOGFONT lf = new LOGFONT();
IntPtr lf0 = Marshal.AllocCoTaskMem(Marshal.SizeOf(lf));
GetObject((IntPtr)m.wparam, Marshal.SizeOf(lf), lf0);
lf = (LOGFONT)Marshal.PtrToStructure(lf0, lf.GetType());
Marshal.FreeCoTaskMem(lf0);
}
break;
case (int)WindowsMessages.WM_DESTROY:
{
// when the control is destroyed the new font is also deleted
if (hFontNew != IntPtr.Zero)
{
DeleteObject(hFontNew);
}
}
break;
}
#endregion
}
}
這件作品將很好地工作與CreateWindow的/ CreateWindowEx功能或創建的窗口，如果Paint event將通過用戶自定義的油漆處理，但我希望是將所有的繪畫留給系統，只改變字體，而不對控件進行任何其他干預。
這種方法應該工作嗎？如果不是，有人可以解釋我爲什麼？我知道當系統繪製控件時，它使用由類的Control.Font屬性設置的字體，但不應該也使用窗口消息中的字體呈現？ 當類處理WndProc方法中的系統消息時，是否在繪畫時繼續傳送WndProc的Message.WParam & Message.LParam中的數據？
例如。當繪製文本時，系統不應該使用WM_GETFONT來使用合適的字體嗎？ 我對於一個不知道任何設置字體渲染類的控件屬性。
是否有解決此問題的其他解決方案？