• 0

[C#] WPF Window with transparency makes WindowsFormsHost disappear


Question

5 answers to this question

Recommended Posts

  • 0
  Nazgulled said:
Hi,

I have a WPF window without border and with Allow Transparency set to true but this makes any WindowsFormsHost component inside the WPF window disappear.

Is there any workaround to solve this?

You'll have to go old school.

I've seen in a few spots on the web where people are asking about using the WebBrowser control with a borderless window. I wondered the same thing. Using straight WPF you can not. However, being the old man that I am, I remember how to use the Win API. Below is the code to not only do it but I threw in some dragging code for good measure.

#region The Classic Window API

//The SendMessage function sends a message to a window or windows.

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]

static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);

//ReleaseCapture releases a mouse capture

[DllImportAttribute("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]

public static extern bool ReleaseCapture();

//SetWindowLong lets you set a window style

[system.Runtime.InteropServices.DllImport("user32.dll")]

static extern int SetWindowLong(IntPtr hWnd, int nIndex, long dwNewLong);

#endregion

/* Borderless - The window which contains the WebBrowser control* /

Window win = new Window();

const int GWL_STYLE = -16;

const long WS_POPUP = 2147483648;

IntPtr hWnd = new System.Windows.Interop.WindowInteropHelper(win).Handle;

SetWindowLong(hWnd, GWL_STYLE, WS_POPUP);

/* Drag Window - Capture this on the mouse down of a control in the window*/

ReleaseCapture();

SendMessage(hWnd, 0xa1, 0x2, 0);

  • 0
  SimpleJack said:
You'll have to go old school.

I've seen in a few spots on the web where people are asking about using the WebBrowser control with a borderless window. I wondered the same thing. Using straight WPF you can not. However, being the old man that I am, I remember how to use the Win API. Below is the code to not only do it but I threw in some dragging code for good measure.

#region The Classic Window API

//The SendMessage function sends a message to a window or windows.

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]

static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);

//ReleaseCapture releases a mouse capture

[DllImportAttribute("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]

public static extern bool ReleaseCapture();

//SetWindowLong lets you set a window style

[system.Runtime.InteropServices.DllImport("user32.dll")]

static extern int SetWindowLong(IntPtr hWnd, int nIndex, long dwNewLong);

#endregion

/* Borderless - The window which contains the WebBrowser control* /

Window win = new Window();

const int GWL_STYLE = -16;

const long WS_POPUP = 2147483648;

IntPtr hWnd = new System.Windows.Interop.WindowInteropHelper(win).Handle;

SetWindowLong(hWnd, GWL_STYLE, WS_POPUP);

/* Drag Window - Capture this on the mouse down of a control in the window*/

ReleaseCapture();

SendMessage(hWnd, 0xa1, 0x2, 0);

Are we sure this works?

  • 0
  dotnetukguru said:
Are we sure this works?

Works like a champ. Also, lets say you have the WebBrowser control in a grid and you want to set margins to provide transparency around the browser. Just extend the glass to the entire window and set your win.Background to Transparent and you are good to go.

In Summary:

IntPtr hWnd = new System.Windows.Interop.WindowInteropHelper(win).Handle;

const int GWL_STYLE = -16;

int style = GetWindowLong(hWnd, GWL_STYLE)

SetWindowLong(hWnd, GWL_STYLE, style );

Extend the glass - Adam Nathan - Extend Glass

Off you go

  • 0
  SimpleJack said:
Also, I had a WS_POPUP constant in the original code. I found it wasn't needed.

Man, I feel like a moron! Yes, you do need the WS_POPUP constant. Sorry about that!

This is the only code you need once you extend the glass and make the background transparent

IntPtr hWnd = new System.Windows.Interop.WindowInteropHelper(win).Handle;

SetWindowLong(hWnd, GWL_STYLE, WS_POPUP);

This topic is now closed to further replies.
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Posts

    • UI is slow but you prefer a slower UI to a snappier UI basically. Everyone is different.
    • XFX 9060 XT 16 GB is $349 on Amazon (shipped & sold by Amazon) https://www.amazon.com/dp/B0F8...p;previewDohDeal=1&th=1 People - never trust any neowin deals posted - they are the worst at seeking deals, and just want to peddle their own to make a quick buck. It's disgusting.
    • It's a grey market key - proceed at your own risk. It's baffling that neowin supports this shady stuff.
    • Arc 1.57.0 by Razvan Serea ARC browser is finally here for Windows, bringing its unique and modern approach to browsing. With a clean interface and a powerful sidebar, ARC makes managing tabs and organizing your workflow a breeze. You can group tabs, pin important pages, and quickly switch between work and personal spaces without clutter. It’s designed to be fast, customizable, and genuinely useful, making it more than just a browser—it’s a productivity tool. If you’re on Windows and want a fresh way to browse and stay organized, ARC is worth checking out. ARC browser key features: Split View: Work with multiple tabs side by side in a single window for efficient multitasking. Tab Grouping: Organize tabs into customizable groups for better workflow management. Pinned Tabs: Keep essential pages permanently accessible in the sidebar. Spaces: Create separate workspaces for different projects or personal use, reducing clutter. Sidebar Integration: Access bookmarks, notes, and tools directly from the sidebar for quick navigation. Customizable Themes: Personalize the browser’s appearance with themes and color schemes. Quick Search: Find tabs, history, or bookmarks instantly with a powerful search bar. Lightning-Fast Performance: Built for speed with optimized resource usage and minimal lag. Built-in Note-Taking: Jot down ideas or save snippets directly within the browser. Focus Mode: Hide distractions and focus on a single tab or task. Cross-Device Syncing: Seamlessly sync your data across multiple devices for a unified experience. Keyboard Shortcuts: Boost productivity with customizable shortcuts for common actions. AI-Powered Suggestions: Get smart recommendations for tabs, bookmarks, and workflows. Privacy Controls: Built-in tools for blocking trackers and managing cookies for enhanced security. Extensions Support: Compatible with popular browser extensions to extend functionality. Arc Browser 1.57.0 release notes: ''Thanks as always for using Arc. This week's release includes a bump to Chromium 137.0.7151.69, which patched three security vulnerabilities. Enjoy!'' Download: Arc Browser 1.57.0 | 1.9 MB (Freeware) View: Arc Browser Website | Screenshot Get alerted to all of our Software updates on Twitter at @NeowinSoftware
  • Recent Achievements

    • First Post
      Uranus_enjoyer earned a badge
      First Post
    • Week One Done
      Uranus_enjoyer earned a badge
      Week One Done
    • Week One Done
      jfam earned a badge
      Week One Done
    • First Post
      survivor303 earned a badge
      First Post
    • Week One Done
      CHUNWEI earned a badge
      Week One Done
  • Popular Contributors

    1. 1
      +primortal
      427
    2. 2
      +FloatingFatMan
      237
    3. 3
      ATLien_0
      213
    4. 4
      snowy owl
      210
    5. 5
      Xenon
      160
  • Tell a friend

    Love Neowin? Tell a friend!