127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
// 17 april 2016
|
|
#include "uipriv_windows.hpp"
|
|
|
|
// The Direct2D scratch window is a utility for libui internal use to do quick things with Direct2D.
|
|
// To use, call newD2DScratch() passing in a subclass procedure. This subclass procedure should handle the msgD2DScratchPaint message, which has the following usage:
|
|
// - wParam - 0
|
|
// - lParam - ID2D1RenderTarget *
|
|
// - lResult - 0
|
|
// Other messages can also be handled here.
|
|
|
|
// TODO allow resize
|
|
|
|
#define d2dScratchClass L"libui_d2dScratchClass"
|
|
|
|
// TODO clip rect
|
|
static HRESULT d2dScratchDoPaint(HWND hwnd, ID2D1RenderTarget *rt)
|
|
{
|
|
COLORREF bgcolorref;
|
|
D2D1_COLOR_F bgcolor;
|
|
|
|
rt->BeginDraw();
|
|
|
|
// TODO only clear the clip area
|
|
// TODO clear with actual background brush
|
|
bgcolorref = GetSysColor(COLOR_BTNFACE);
|
|
bgcolor.r = ((float) GetRValue(bgcolorref)) / 255.0;
|
|
// due to utter apathy on Microsoft's part, GetGValue() does not work with MSVC's Run-Time Error Checks
|
|
// it has not worked since 2008 and they have *never* fixed it
|
|
bgcolor.g = ((float) ((BYTE) ((bgcolorref & 0xFF00) >> 8))) / 255.0;
|
|
bgcolor.b = ((float) GetBValue(bgcolorref)) / 255.0;
|
|
bgcolor.a = 1.0;
|
|
rt->Clear(&bgcolor);
|
|
|
|
SendMessageW(hwnd, msgD2DScratchPaint, 0, (LPARAM) rt);
|
|
|
|
return rt->EndDraw(NULL, NULL);
|
|
}
|
|
|
|
static LRESULT CALLBACK d2dScratchWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
|
|
{
|
|
LONG_PTR init;
|
|
ID2D1HwndRenderTarget *rt;
|
|
HRESULT hr;
|
|
|
|
init = GetWindowLongPtrW(hwnd, 0);
|
|
if (!init) {
|
|
if (uMsg == WM_CREATE)
|
|
SetWindowLongPtrW(hwnd, 0, (LONG_PTR) TRUE);
|
|
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
|
|
}
|
|
|
|
rt = (ID2D1HwndRenderTarget *) GetWindowLongPtrW(hwnd, GWLP_USERDATA);
|
|
if (rt == NULL) {
|
|
rt = makeHWNDRenderTarget(hwnd);
|
|
SetWindowLongPtrW(hwnd, GWLP_USERDATA, (LONG_PTR) rt);
|
|
}
|
|
|
|
switch (uMsg) {
|
|
case WM_DESTROY:
|
|
rt->Release();
|
|
SetWindowLongPtrW(hwnd, 0, (LONG_PTR) FALSE);
|
|
break;
|
|
case WM_PAINT:
|
|
hr = d2dScratchDoPaint(hwnd, rt);
|
|
switch (hr) {
|
|
case S_OK:
|
|
if (ValidateRect(hwnd, NULL) == 0)
|
|
logLastError(L"error validating D2D scratch control rect");
|
|
break;
|
|
case D2DERR_RECREATE_TARGET:
|
|
// DON'T validate the rect
|
|
// instead, simply drop the render target
|
|
// we'll get another WM_PAINT and make the render target again
|
|
// TODO would this require us to invalidate the entire client area?
|
|
rt->Release();
|
|
SetWindowLongPtrW(hwnd, GWLP_USERDATA, (LONG_PTR) NULL);
|
|
break;
|
|
default:
|
|
logHRESULT(L"error drawing D2D scratch window", hr);
|
|
}
|
|
return 0;
|
|
case WM_PRINTCLIENT:
|
|
// TODO
|
|
break;
|
|
}
|
|
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
|
|
}
|
|
|
|
ATOM registerD2DScratchClass(HICON hDefaultIcon, HCURSOR hDefaultCursor)
|
|
{
|
|
WNDCLASSW wc;
|
|
|
|
ZeroMemory(&wc, sizeof (WNDCLASSW));
|
|
wc.lpszClassName = d2dScratchClass;
|
|
wc.lpfnWndProc = d2dScratchWndProc;
|
|
wc.hInstance = hInstance;
|
|
wc.hIcon = hDefaultIcon;
|
|
wc.hCursor = hDefaultCursor;
|
|
wc.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1);
|
|
wc.cbWndExtra = sizeof (LONG_PTR); // for the init status
|
|
return RegisterClassW(&wc);
|
|
}
|
|
|
|
void unregisterD2DScratchClass(void)
|
|
{
|
|
if (UnregisterClassW(d2dScratchClass, hInstance) == 0)
|
|
logLastError(L"error unregistering D2D scratch window class");
|
|
}
|
|
|
|
HWND newD2DScratch(HWND parent, RECT *rect, HMENU controlID, SUBCLASSPROC subclass, DWORD_PTR subclassData)
|
|
{
|
|
HWND hwnd;
|
|
|
|
hwnd = CreateWindowExW(0,
|
|
d2dScratchClass, L"",
|
|
WS_CHILD | WS_VISIBLE,
|
|
rect->left, rect->top,
|
|
rect->right - rect->left, rect->bottom - rect->top,
|
|
parent, controlID, hInstance, NULL);
|
|
if (hwnd == NULL)
|
|
// TODO return decoy window
|
|
logLastError(L"error creating D2D scratch window");
|
|
if (SetWindowSubclass(hwnd, subclass, 0, subclassData) == FALSE)
|
|
logLastError(L"error subclassing D2D scratch window");
|
|
return hwnd;
|
|
}
|