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Multiple selection of nodes using mouse (Read 2169 times)

rajesh_patil74 Full Member Offline I love YaBB 1G - SP1! Posts: 220 Joined: Sep 3^rd, 2009	Multiple selection of nodes using mouse Jun 17^th, 2010 at 8:03am	Print Post
	Hi Stoyo I have place Diagram control inside the scrollviewer control and aligned this control vertical and horizontally central. The background diagram control is same as scrollviewer control and i don't have enabled the grid style. Because of above setting, it seems that the white region of scrollviewer where actually diagram control is not placed is also a part of diagram control. Now user presses the left mouse button down and tries to move the mouse on right side of the diagram to select few nodes but no selection rectanagle gets drawn. If user presses the mouse button down in the diagram regioin and move it starts drawing the selection rectangle and with mouse up even select all diagram items which are within a rectangle region. I have also noticed that , once the selection rectangle is drawn it is possible to move the mouse out of diagram region and selection rectangle is also drawn out side the diagram region. But mouse up event outside the diagram region doesn't select any items. [In short - to select items mouse down and mouse up events needs to be in diagram region only. How it can be possible in the above situation.] Regards Rajesh


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Lyubo God Member Offline MindFusion team Posts: 511 Joined: Jun 17^th, 2010	Re: Multiple selection of nodes using mouse Reply #1 - Jun 17^th, 2010 at 2:58pm	Print Post
	Hi Rajesh, Unfortunately, currently it's not possible that the diagram handles click events on the ScrollViewer. What you could try, is to handle the ScrollViewer SizeChanged event and make sure that the diagram resezes itself to fully occupy the ScrollViewer's area. One possible implementation is this: Code private void ScrollViewer_SizeChanged(object sender, SizeChangedEventArgs e) { ScrollViewer sv = sender as ScrollViewer; Rect newBounds = sv.GetRect(); //Account for any applied ZoomFactor on the diagram if (diagram.ZoomFactor != 100) { newBounds.Width = 100 / diagram.ZoomFactor; newBounds.Height = 100 / diagram.ZoomFactor; } Rect r = diagram.Bounds; r.Union(newBounds); diagram.Bounds = r; } Regards, Lyubo


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rajesh_patil74 Full Member Offline I love YaBB 1G - SP1! Posts: 220 Joined: Sep 3^rd, 2009	Re: Multiple selection of nodes using mouse Reply #2 - Jun 24^th, 2010 at 9:41am	Print Post
	Hi Lyubo with sv.GetRect() I always get vertical and horizontal scrollbar visible. Instead of sv.GetRect() I used new Rect(0,0, sv.ActualWidth-50, sv.ActualHeight - 50) the diagram covers the complete scrollviewer region but my diagram nodes are visible in top-left corner ( Previously my diagram node is visible in the center) The another issue with this is that, my scrollviewer control is placed is grid which is resizable. If initially i increase the size of my grid region and later on descreases it , the diagram region still occupies same area since union is used and diagram bounds are already high than the scrollviewer area. I guess, some change in diagram control is required for same. Regards Rajesh


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Lyubo God Member Offline MindFusion team Posts: 511 Joined: Jun 17^th, 2010	Re: Multiple selection of nodes using mouse Reply #3 - Jun 24^th, 2010 at 11:39am	Print Post
	Hi Rajesh, Could you try if the below code fixes your issue (replace the last three lines in the previous sample): Code Rect r = diagram.GetContentBounds(false, false); double wDiff = newBounds.Width - r.Width; double hDiff = newBounds.Height - r.Height; if (r.Width < newBounds.Width) { r.X -= wDiff / 2; r.Width += wDiff; } if (r.Height < newBounds.Height) { r.Y -= hDiff / 2; r.Height += hDiff; } diagram.Bounds = r; Regards, Lyubo


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