How to Create Borderless Windows with Aero Enhancements: Snapping, Shadow, and Smooth Animations?

Creating Borderless Windows with Aero Enhancements

This article addresses the challenge of implementing borderless windows with Aero snap, shadow, minimize animation, and shake effects.

Hiding the Window Border

To hide the window's border, handle the WM_NCCALCSIZE message in the WindowProc:

<code class="c++">case WM_NCCALCSIZE: {
    if (window->is_borderless) {
        return 0;
    } else {
        return DefWindowProc(hwnd, msg, wparam, lparam);
    }
}</code>

Enabling the Aero Shadow

To enable the Aero shadow:

<code class="c++">MARGINS borderless = {1,1,1,1};
DwmExtendFrameIntoClientArea(hwnd, &amp;borderless);</code>

Enabling Aero Snap and Other Enhancements

To achieve Aero snap, maximizing, minimizing, and smooth minimize animation, use the following window style:

<code class="c++">WS_POPUP | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_CAPTION</code>

Note: It's crucial to ensure that your window style does not include a title bar to enable the shadow.

Cautions

• DwmExtendFrameIntoClientArea extends the frame into the client area, potentially causing alpha-transparent images to reveal a small frame. Consider using non-transparent elements behind transparent areas.
• Toggling between borderless and windowed mode using F11, and toggling the borderless shadow on/off using F12, demonstrates the implementation.

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