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#if defined(Hiro_Canvas)
namespace hiro {
static auto CALLBACK Canvas_windowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) -> LRESULT {
auto object = (mObject*)GetWindowLongPtr(hwnd, GWLP_USERDATA);
if(!object) return DefWindowProc(hwnd, msg, wparam, lparam);
auto canvas = dynamic_cast<mCanvas*>(object);
if(!canvas) return DefWindowProc(hwnd, msg, wparam, lparam);
if(msg == WM_DROPFILES) {
if(auto paths = DropPaths(wparam)) canvas->doDrop(paths);
return false;
}
if(msg == WM_GETDLGCODE) {
return DLGC_STATIC | DLGC_WANTCHARS;
}
if(msg == WM_ERASEBKGND) {
//background is erased during WM_PAINT to prevent flickering
return true;
}
if(msg == WM_PAINT) {
if(auto self = canvas->self()) self->_paint();
return true;
}
if(msg == WM_MOUSEMOVE) {
TRACKMOUSEEVENT tracker{sizeof(TRACKMOUSEEVENT), TME_LEAVE, hwnd};
TrackMouseEvent(&tracker);
canvas->doMouseMove({(int16_t)LOWORD(lparam), (int16_t)HIWORD(lparam)});
}
if(msg == WM_MOUSELEAVE) {
canvas->doMouseLeave();
}
if(msg == WM_LBUTTONDOWN || msg == WM_MBUTTONDOWN || msg == WM_RBUTTONDOWN) {
switch(msg) {
case WM_LBUTTONDOWN: canvas->doMousePress(Mouse::Button::Left); break;
case WM_MBUTTONDOWN: canvas->doMousePress(Mouse::Button::Middle); break;
case WM_RBUTTONDOWN: canvas->doMousePress(Mouse::Button::Right); break;
}
}
if(msg == WM_LBUTTONUP || msg == WM_MBUTTONUP || msg == WM_RBUTTONUP) {
switch(msg) {
case WM_LBUTTONUP: canvas->doMouseRelease(Mouse::Button::Left); break;
case WM_MBUTTONUP: canvas->doMouseRelease(Mouse::Button::Middle); break;
case WM_RBUTTONUP: canvas->doMouseRelease(Mouse::Button::Right); break;
}
}
return DefWindowProc(hwnd, msg, wparam, lparam);
}
auto pCanvas::construct() -> void {
hwnd = CreateWindow(L"hiroCanvas", L"", WS_CHILD, 0, 0, 0, 0, _parentHandle(), nullptr, GetModuleHandle(0), 0);
SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG_PTR)&reference);
pWidget::_setState();
setDroppable(state().droppable);
update();
}
auto pCanvas::destruct() -> void {
DestroyWindow(hwnd);
}
auto pCanvas::minimumSize() const -> Size {
if(auto& icon = state().icon) return {(int)icon.width(), (int)icon.height()};
return {0, 0};
}
auto pCanvas::setColor(Color color) -> void {
update();
}
auto pCanvas::setDroppable(bool droppable) -> void {
DragAcceptFiles(hwnd, droppable);
}
auto pCanvas::setGeometry(Geometry geometry) -> void {
pWidget::setGeometry(geometry);
update();
}
auto pCanvas::setGradient(Gradient gradient) -> void {
update();
}
auto pCanvas::setIcon(const image& icon) -> void {
update();
}
auto pCanvas::update() -> void {
_rasterize();
_redraw();
}
auto pCanvas::_paint() -> void {
PAINTSTRUCT ps;
BeginPaint(hwnd, &ps);
HDC hdc = CreateCompatibleDC(ps.hdc);
BITMAPINFO bmi;
memset(&bmi, 0, sizeof(BITMAPINFO));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biWidth = width;
bmi.bmiHeader.biHeight = -height; //GDI stores bitmaps upside now; negative height flips bitmap
bmi.bmiHeader.biSizeImage = pixels.size() * sizeof(uint32_t);
void* bits = nullptr;
HBITMAP bitmap = CreateDIBSection(hdc, &bmi, DIB_RGB_COLORS, &bits, nullptr, 0);
if(bits) {
auto source = (const uint8_t*)pixels.data();
auto target = (uint8_t*)bits;
for(auto n : range(width * height)) {
target[0] = (source[0] * source[3]) / 255;
target[1] = (source[1] * source[3]) / 255;
target[2] = (source[2] * source[3]) / 255;
target[3] = (source[3]);
source += 4, target += 4;
}
}
SelectObject(hdc, bitmap);
RECT rc;
GetClientRect(hwnd, &rc);
DrawThemeParentBackground(hwnd, ps.hdc, &rc);
BLENDFUNCTION bf{AC_SRC_OVER, 0, (BYTE)255, AC_SRC_ALPHA};
AlphaBlend(ps.hdc, 0, 0, width, height, hdc, 0, 0, width, height, bf);
DeleteObject(bitmap);
DeleteDC(hdc);
EndPaint(hwnd, &ps);
}
auto pCanvas::_rasterize() -> void {
if(auto& icon = state().icon) {
width = icon.width();
height = icon.height();
} else {
width = self().geometry().width();
height = self().geometry().height();
}
if(width <= 0 || height <= 0) return;
pixels.reset();
pixels.resize(width * height);
if(auto& icon = state().icon) {
memory::copy(pixels.data(), icon.data(), width * height * sizeof(uint32_t));
} else if(auto& gradient = state().gradient) {
auto& colors = gradient.state.colors;
image fill;
fill.allocate(width, height);
fill.gradient(colors[0].value(), colors[1].value(), colors[2].value(), colors[3].value());
memory::copy(pixels.data(), fill.data(), fill.size());
} else {
uint32_t color = state().color.value();
for(auto& pixel : pixels) pixel = color;
}
}
auto pCanvas::_redraw() -> void {
InvalidateRect(hwnd, 0, false);
}
}
#endif
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