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#if defined(Hiro_Canvas)
namespace hiro {
auto pCanvas::construct() -> void {
hwnd = CreateWindow(L"hiroWidget", L"", WS_CHILD, 0, 0, 0, 0, _parentHandle(), nullptr, GetModuleHandle(0), 0);
pWidget::construct();
update();
}
auto pCanvas::destruct() -> void {
DestroyWindow(hwnd);
}
auto pCanvas::minimumSize() const -> Size {
if(auto& icon = state().icon) return {(s32)icon.width(), (s32)icon.height()};
return {0, 0};
}
auto pCanvas::setAlignment(Alignment) -> void {
update();
}
auto pCanvas::setColor(Color color) -> void {
update();
}
auto pCanvas::setDroppable(bool droppable) -> void {
DragAcceptFiles(hwnd, droppable);
}
auto pCanvas::setFocusable(bool focusable) -> void {
//handled by windowProc()
}
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::doMouseLeave() -> void {
return self().doMouseLeave();
}
auto pCanvas::doMouseMove(s32 x, s32 y) -> void {
return self().doMouseMove({x, y});
}
auto pCanvas::windowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) -> maybe<LRESULT> {
if(msg == WM_DROPFILES) {
if(auto paths = DropPaths(wparam)) self().doDrop(paths);
return false;
}
if(msg == WM_KEYDOWN || msg == WM_SYSKEYDOWN || msg == WM_KEYUP || msg == WM_SYSKEYUP) {
if(self().focusable()) return true;
}
if(msg == WM_GETDLGCODE) {
return DLGC_STATIC | DLGC_WANTCHARS;
}
if(msg == WM_ERASEBKGND || msg == WM_PAINT) {
_paint();
return msg == WM_ERASEBKGND;
}
if(msg == WM_LBUTTONDOWN) {
if(self().focusable()) setFocused();
}
return pWidget::windowProc(hwnd, msg, wparam, lparam);
}
//
auto pCanvas::_paint() -> void {
PAINTSTRUCT ps;
BeginPaint(hwnd, &ps);
s32 sx = 0, sy = 0, dx = 0, dy = 0;
s32 width = this->width;
s32 height = this->height;
auto geometry = self().geometry();
auto alignment = state().alignment ? state().alignment : Alignment{0.5, 0.5};
if(width <= geometry.width()) {
sx = 0;
dx = (geometry.width() - width) * alignment.horizontal();
} else {
sx = (width - geometry.width()) * alignment.horizontal();
dx = 0;
width = geometry.width();
}
if(height <= geometry.height()) {
sy = 0;
dy = (geometry.height() - height) * alignment.vertical();
} else {
sy = (height - geometry.height()) * alignment.vertical();
dy = 0;
height = geometry.height();
}
HDC hdc = CreateCompatibleDC(ps.hdc);
BITMAPINFO bmi{};
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 = width * height * sizeof(u32);
void* bits = nullptr;
HBITMAP bitmap = CreateDIBSection(hdc, &bmi, DIB_RGB_COLORS, &bits, nullptr, 0);
if(bits) {
for(u32 y : range(height)) {
auto source = (const u8*)pixels.data() + (sy + y) * this->width * sizeof(u32) + sx * sizeof(u32);
auto target = (u8*)bits + y * width * sizeof(u32);
for(u32 x : range(width)) {
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, dx, dy, 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<u32>(pixels.data(), icon.data(), width * height);
} 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 {
u32 color = state().color.value();
for(auto& pixel : pixels) pixel = color;
}
}
auto pCanvas::_redraw() -> void {
InvalidateRect(hwnd, 0, false);
}
}
#endif
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