Function BackgroundWndProc

nsisplugin/DialogInit.c:321–383

}

static LRESULT CALLBACK BackgroundWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
	switch (uMsg) {
	case WM_PAINT: {
		PAINTSTRUCT ps = {0};
		HDC hdc = BeginPaint(hwnd, &ps);
		RECT rect = {0};
		GetClientRect(hwnd, &rect);

		// Gradient
		int height = rect.bottom - rect.top;
		int width = rect.right - rect.left;

		for (int i = 0; i < height; i++) {
			float ratio = (float)(i - rect.top) / (float)(rect.bottom - rect.top);
			COLORREF color = RGB(
				(int)(0x00 * (1 - ratio) + 0x00 * ratio),
				(int)(0x00 * (1 - ratio) + 0x00 * ratio),
				(int)(0x80 * (1 - ratio) + 0x00 * ratio)
			);

			RECT lineRect = {rect.left, rect.top + i, rect.right, rect.top + i + 1};
			HBRUSH brush = CreateSolidBrush(color);
			FillRect(hdc, &lineRect, brush);
			DeleteObject(brush);
		}

		HFONT font = CreateFont(-40, 0, 0, 0, FW_BOLD, TRUE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, ANTIALIASED_QUALITY, FF_DONTCARE | FIXED_PITCH, L"Times New Roman");
		HFONT oldFont = (HFONT)SelectObject(hdc, font);

		static LPWSTR text = L"Legacy Update";

		// Shadow
		SetTextColor(hdc, RGB(0x00, 0x00, 0x00));
		SetBkMode(hdc, TRANSPARENT);
		TextOut(hdc, 10 + 4, 4 + 4, text, lstrlen(text));

		// Text
		SetTextColor(hdc, RGB(0xff, 0xff, 0xff));
		TextOut(hdc, 10, 4, text, lstrlen(text));
		SelectObject(hdc, oldFont);
		DeleteObject(font);

		EndPaint(hwnd, &ps);
		return 0;
	}

	case WM_ERASEBKGND:
		return 1;

	case WM_ACTIVATE:
		// If we become foreground, bring the main dialog to front
		if (LOWORD(wParam) != WA_INACTIVE) {
			SetForegroundWindow(g_hwndParent);
		}
		return 0;

	case WM_CLOSE:
		// Don't allow closing