This Event handler returns:
System.Runtime.InteropServices.COMException: 'Unknown name. (Exception from HRESULT: 0x80020006 (DISP_E_UNKNOWNNAME))'
Code:
private void Browser_Loaded(object sender, NavigationEventArgs e)
{
browser.InvokeScript("Document.Body.Style =" + "zoom:80%");
}
i have tried many solutions found online, but none seem to work for me
please advise
Try this
private void Browser_Loaded(object sender, NavigationEventArgs e)
{
var zoom = 0.8;
mshtml.IHTMLDocument2 doc = browser.Document as mshtml.IHTMLDocument2;
doc.parentWindow.execScript("document.body.style.zoom=" + zoom.ToString().Replace(",", ".") + ";");
}
Its working for me.
Don't forget to reference Microsoft.mshtml
References:
WPF WebBrowser - How to Zoom Content?
Zoom WPF-WebBrowser-Control Content
Related
I know how to subscribe to the CoreWebview2.DownloadStarting event and use handled = true to stop the Download dialog from showing while a download (i.e. an image) is being made, but the problem is the DownloadStarting event never fires if you right click on a web page and choose "Save as" or "Print > Save as PDF", even though the Download dialog will appear as if a regular download was being made. Does anyone know any workaround for this?
My code:
public Form1()
{
InitializeComponent();
}
private async void button1_Click(object sender, EventArgs e)
{
if (webView != null)
webView.Dispose();
webView = new WebView2();
await webView.EnsureCoreWebView2Async();
webView.CoreWebView2.DownloadStarting += CoreWebView2_DownloadStarting;
panel1.Controls.Add(webView);
webView.Dock = DockStyle.Fill;
webView.Source = new Uri("https://www.microsoft.com");
}
private void CoreWebView2_DownloadStarting(object sender, CoreWebView2DownloadStartingEventArgs e)
{
e.Handled = true;
}
I just found a solution:
subscribe to CoreWebView2.IsDefaultDownloadDialogOpenChanged event:
webView.CoreWebView2.IsDefaultDownloadDialogOpenChanged += webView_CoreWebView2_IsDefaultDownloadDialogOpenChanged;
Close the Download dialog if it's open:
private void webView_CoreWebView2_IsDefaultDownloadDialogOpenChanged(object sender, object e)
{
if (webView.CoreWebView2.IsDefaultDownloadDialogOpen) webView.CoreWebView2.CloseDefaultDownloadDialog();
}
I am trying to prevent users from dragging images that display in my webbrowser control.
I tried setting webbrowser.Document.MouseOver e.Cursor = Cursors.No Still not working.
I tried a few other ways.
I am unable to prevent images being dragged on the desktop.
Is it possible to prevent dragging of images from webbrowser control to desktop?
There is a way to prevent the body element of the HTML document to handle drag operation.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
this.webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
this.webBrowser1.Url = new Uri("https://www.google.bg/search?q=stackoverflow&biw=1920&bih=950&source=lnms&tbm=isch&sa=X&sqi=2&ved=0ahUKEwjw2cWH4oTQAhVG8RQKHWCWB4AQ_AUIBigB");
}
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
this.webBrowser1.Document.Body.Drag += new HtmlElementEventHandler(Body_Drag);
}
private void Body_Drag(object sender, HtmlElementEventArgs e)
{
e.ReturnValue = false;
}
}
We know very well how easy is too create a WPF application where user can paint a rectangle using the mouse. To do this you just create a Rectangle control and set its coordinates, you don't worry about DoubleBuffering, repainting and such stuff. Well, I'd be very happy yo use WPF for the application where user can paint different shapes, but the clients insists to be a WinForms application. So the solution here is to use the XOR or ROP operation like in old good WinAPI years and I don't really like this. This doesn't give me a nice option to move a text while in XOR mode.
So I was thinking how can I achieve same smooth painting experience in a WinForms application like I'd have in WPF. Put together such a code, where I wanted to create a separate layer where I'd paint the current shape, while leaving intact the rest of the objects. I used same technique in an iPad application and worked pretty well.
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
namespace TestPainting
{
public partial class Form1 : Form
{
private bool _isMouseDown;
private Graphics _bufferGraphics;
private Point _startPos;
private TransparentPanel _paintBuffer;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
_isMouseDown = true;
_paintBuffer = new TransparentPanel
{
Size = Size,
};
Controls.Add(_paintBuffer);
_paintBuffer.BringToFront();
_bufferGraphics = Graphics.FromHwnd(_paintBuffer.Handle);
_startPos = e.Location;
Capture = true;
}
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
if (!_isMouseDown)
return;
_bufferGraphics.Clear(Color.Transparent);
_bufferGraphics.DrawRectangle(Pens.Green, _startPos.X, _startPos.Y, e.X - _startPos.X, e.Y - _startPos.Y);
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
_isMouseDown = false;
Capture = false;
_bufferGraphics.Dispose();
Controls.Remove(_paintBuffer);
_paintBuffer.Dispose();
}
}
public class TransparentPanel : Panel
{
public TransparentPanel()
{
DoubleBuffered = true;
}
[Browsable(false)]
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x20;
return cp;
}
}
protected override void OnPaintBackground(PaintEventArgs e)
{
// Do Nothing
}
}
}
which if course doesn't work as needed. I'm getting a black panel when pressing the mouse instead of a transparent one. Plus the rectangle while is painted flickers a lot, even though I did set the DoubleBuffering stuff.
Can someone provide some better ideas of such an implementation or maybe there some other open source project where I can see how other people are doing. I'd need to have same experience as in Paint.NET, just too bad is not open source anymore. (I know I can use Reflector, and I did, but man, there is tons of code over there :) )
Thx for any ideas.
Try this (see FIX #1 and FIX #2):
private void Form1_MouseDown( object sender, MouseEventArgs e )
{
_isMouseDown = true;
_paintBuffer = new TransparentPanel
{
Size = Size,
};
Controls.Add( _paintBuffer );
_paintBuffer.BringToFront();
// FIX #1:
//
this.Refresh();
_bufferGraphics = Graphics.FromHwnd( _paintBuffer.Handle );
_startPos = e.Location;
Capture = true;
}
private void Form1_MouseMove( object sender, MouseEventArgs e )
{
if ( !_isMouseDown )
return;
//FIX #2:
// _bufferGraphics.Clear( Color.Transparent );
_bufferGraphics.Clear( this.BackColor );
_bufferGraphics.DrawRectangle( Pens.Green, _startPos.X, _startPos.Y, e.X - _startPos.X, e.Y - _startPos.Y );
}
I have a dynamically generated hyperlink which when clicked should open a lotus notes document. I do it using the code below.
HyperlinkButton hlb = new HyperlinkButton();
hlb.SetBinding(HyperlinkButton.ContentProperty, new Binding("Properties[" + col.DisplayField + "]"));
hlb.SetBinding(HyperlinkButton.NavigateUriProperty, new Binding("Properties[" + col.LinkField + "]"));
hlb.Click += new RoutedEventHandler(hlb_Click);
RootGrid.Children.Add(hlb);
this is the code that fires when the link is clicked.
static void hlb_Click(object sender, RoutedEventArgs e)
{
HyperlinkButton hlb = (HyperlinkButton)sender;
var hostingWindow = HtmlPage.Window;
hostingWindow.Navigate(hlb.NavigateUri);
}
the lotus notes document opens correctly but I get a System.InvalidOperationException, the details of which are given below
Description: Failed to navigate to notes://<path to the document>
Stacktrace:
at MS.Internal.NavigationHelper.Navigate(Boolean checkUserInitiatedAction)
at System.Windows.Controls.HyperlinkButton.OnClick()
at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)
Another interesting thing to note is that it is raised on another thread and hence is not caught when the hostingWindow.Navigate method is fired.
Any ideas ?
Using Silverlight 5, I wrapped the call to open the Lotus Notes doc link within a task and was able to open the link without generating an error.
private void TryOpenDocLink()
{
TaskScheduler ts = TaskScheduler.Default;
Task<bool> task = OpenDocLink();
task.ContinueWith(t =>
{
if (t.Exception != null)
{
this.SetError(t.Exception.Message, enMessageLevel.Error);
}
});
}
private Task<bool> OpenDocLink()
{
TaskCompletionSource<bool> tcs = new TaskCompletionSource<bool>();
try
{
var hostWindow = HtmlPage.Window;
hostWindow.Navigate(new Uri(DocLinkPath));
tcs.SetResult(true);
}
catch (Exception)
{
tcs.SetResult(false);
}
return tcs.Task;
}
Try marking the click event as handled:
static void hlb_Click(object sender, RoutedEventArgs e)
{
e.Handled = true;
HyperlinkButton hlb = (HyperlinkButton)sender;
var hostingWindow = HtmlPage.Window;
hostingWindow.Navigate(hlb.NavigateUri);
}
I'm not sure that this will fix the issue. The error is coming from the click event code inside the hyperlink button. You can tell because that code uses the NavigationHelper class while the Window.Navigate method does not.
Is there a reason you're not just letting the hyperlink button do the navigation?
How would I be able to submit events manually to be received by InkCanvas ?
What I need to do, is to set the mode of InkCanvas to ink mode, and then, send virtual events to InkCanvas so that I get a drawing behavior as if user used the real mouse.
Thanks
The following code snippet shows an example of drawing a shape in InkCanvas:
StylusPointCollection stroke1Points = new StylusPointCollection();
stroke1Points.Add(new StylusPoint(50,10));
stroke1Points.Add(new StylusPoint(90,50));
stroke1Points.Add(new StylusPoint(10,50));
stroke1Points.Add(new StylusPoint(50,10));
Stroke stroke1 = new Stroke(stroke1Points);
canvas.Strokes.Add(stroke1);
Where canvas is of type InkCanvas. The above generates a triangle in the canvas.
"And yes, you may accept the answer if it helps you."
Something like this?
private void inkSurface_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
inkSurface.CaptureMouse();
_inkStroke = new Stroke(
e.StylusDevice.GetStylusPoints(inkSurface));
_inkStroke.DrawingAttributes.Width = 5;
_inkStroke.DrawingAttributes.Height = 5;
_inkStroke.DrawingAttributes.Color = Colors.Black;
inkSurface.Strokes.Add(_inkStroke);
e.Handled = true;
}
private void inkSurface_MouseMove(object sender, MouseEventArgs e)
{
if (_inkStroke != null)
{
_inkStroke.StylusPoints.Add(
e.StylusDevice.GetStylusPoints(inkSurface));
}
e.Handled = true;
}
private void inkSurface_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
inkSurface.ReleaseMouseCapture();
e.Handled = true;
}