Codejock Developer Community : Canvas GetTop and SetTop http://forum.codejock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Tue, 07 Apr 2026 20:39:56 +0000 Thu, 12 Apr 2012 18:23:25 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 forum.codejock.com/RSS_post_feed.asp?TID=19616 <![CDATA[Codejock Developer Community]]> http://forum.codejock.com/forum_images/codejock-logo.gif http://forum.codejock.com/ <![CDATA[Canvas GetTop and SetTop : Oh sorry, now I realized that...]]> http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67984&title=canvas-gettop-and-settop#67984 Author: Krog
Subject: 19616
Posted: 12 April 2012 at 6:23pm

Oh sorry, now I realized that the parser does not uses the "TextBlock." and "Image." in the setter lines, it uses only the Visibility property, right? Because the entire Border is becoming invisible...]]> Thu, 12 Apr 2012 18:23:25 +0000 http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67984&title=canvas-gettop-and-settop#67984 <![CDATA[Canvas GetTop and SetTop : There is a lot of flickering in...]]> http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67983&title=canvas-gettop-and-settop#67983 Author: Krog
Subject: 19616
Posted: 12 April 2012 at 6:05pm

There is a lot of flickering in this example, when the mouse is over:

<Page>

<Page.Resources>

        <Style TargetType="Grid">
            <Setter Property="Background" Value="White"/>
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Trigger.Setters>
                        <Setter Property="TextBlock.Visibility" Value="Hidden"/>
                        <Setter Property="Image.Visibility" Value="Visible"/>
                    </Trigger.Setters>
                </Trigger>
            </Style.Triggers>
        </Style>

</Page.Resources>

<Border Cursor='Hand'>
<Grid><Grid.ColumnDefinitions><ColumnDefinition Width='Auto'/><ColumnDefinition Width='*'/><ColumnDefinition Width='Auto'/></Grid.ColumnDefinitions><Grid.RowDefinitions><RowDefinition/><RowDefinition/></Grid.RowDefinitions>
<Image Grid.RowSpan='2' Width='20' VerticalAlignment='Center' Source='file://AnyTinyImage.png'/>
<TextBlock Grid.Column='1' Grid.Row='0' Margin='2, 0, 0, 0' Foreground='#404040'>%name%</TextBlock>
<TextBlock Grid.Column='1' Grid.Row='1' Margin='40, 0, 0, 0' Foreground='#a0a0a0'>%source%</TextBlock>
<Image Grid.Column='2' Grid.RowSpan='2' Width='20' Source='file://AnyTinyImage.png' Visibility='Hidden'/>
</Grid>
</Border>
</Page>

And I suspect that the reason is the same as before.

The trigger set the TextBlock Visibility to Hidden, and once it is hidden, the mouse is not more over a visible child element.

Note also that the property "Image.Visibility" is not changed. I suspect it is not supported, only TextBlocks. Am I right? Can they be supported?


]]> Thu, 12 Apr 2012 18:05:58 +0000 http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67983&title=canvas-gettop-and-settop#67983 <![CDATA[Canvas GetTop and SetTop : Interestingly, if we set a background...]]> http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67982&title=canvas-gettop-and-settop#67982 Author: Krog
Subject: 19616
Posted: 12 April 2012 at 5:37pm

Interestingly, if we set a background on the parent element, it does work!

Changing the parent element to this:

<Border Background='White' Cursor='Hand'>

makes the cursor change to a Hand whenever the mouse is over the parent element.

But, this information is only to help you, since I need a transparent background... :/

Thanks in advance for any reply!
]]> Thu, 12 Apr 2012 17:37:01 +0000 http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67982&title=canvas-gettop-and-settop#67982 <![CDATA[Canvas GetTop and SetTop : I tested now with a Canvas and...]]> http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67981&title=canvas-gettop-and-settop#67981 Author: Krog
Subject: 19616
Posted: 12 April 2012 at 5:14pm

I tested now with a Canvas and the result is the same. To test it's only to replace the parent Border with a Canvas.]]> Thu, 12 Apr 2012 17:14:51 +0000 http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67981&title=canvas-gettop-and-settop#67981 <![CDATA[Canvas GetTop and SetTop : Another related problem:When we...]]> http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67980&title=canvas-gettop-and-settop#67980 Author: Krog
Subject: 19616
Posted: 12 April 2012 at 5:12pm

Another related problem:

When we set a Cursor to a parent container (in this case a Border element) we expect that when the mouse is over it the cursor must be the specified one.

But what happens is that the cursor only changes when it is over a child element. If the mouse pointer is over an empty space inside the parent element, the cursor does not changes (and it is expected to change since the property was specified to the parent element).

Here is an example:

<Border Cursor='Hand'>
<Grid><Grid.ColumnDefinitions><ColumnDefinition Width='Auto'/><ColumnDefinition Width='*'/><ColumnDefinition Width='Auto'/></Grid.ColumnDefinitions><Grid.RowDefinitions><RowDefinition/><RowDefinition/></Grid.RowDefinitions>
<Image Grid.RowSpan='2' Width='20' VerticalAlignment='Center' Source='file://AnyTinyImageHere.png '/>
<TextBlock Grid.Column='1' Grid.Row='0' Margin='2, 0, 0, 0' Foreground='#404040'>%name%</TextBlock>
<TextBlock Grid.Column='1' Grid.Row='1' Margin='40, 0, 0, 0' Foreground='#a0a0a0'>%source%</TextBlock>
<Image Grid.Column='2' Grid.RowSpan='2' Width='20' Source='file://AnyTinyImageHere.png'/>
</Grid>
</Border>

In this case, the cursor only changes when the mouse is over any TextBlock  or image element. If the mouse is above or bellow an image, or at the left of the second TextBlock, it remains the default.

]]> Thu, 12 Apr 2012 17:12:03 +0000 http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67980&title=canvas-gettop-and-settop#67980 <![CDATA[Canvas GetTop and SetTop : Another discovery: when I set...]]> http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67977&title=canvas-gettop-and-settop#67977 Author: Krog
Subject: 19616
Posted: 12 April 2012 at 2:56am


Another discovery: when I set a MouseMove event to a Canvas element it only fires the event when the mouse is over a child element, the event is not fired when the mouse is moved over a empty space inside the canvas.

I need these features to make possible to the user to move elements inside a canvas using the mouse, like drag'n'drop.

Here is an example project:
 
uploads/3733/TestMarkupMouseCapture.rar

When run, hold the mouse left button over some colored border element and then move it vertically. When the mouse is over the border we can move (in this case) the entire label control, but if we move the mouse to the right outside the border, then we can't move it anymore. The MouseMove event is not fired in this case.

The XAML code used can be checked inside the MarkupLabel Caption property.

Having the Set functions working and this event working we can implement this functionality. Hope you can do it.

Thanks in advance!

]]> Thu, 12 Apr 2012 02:56:07 +0000 http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67977&title=canvas-gettop-and-settop#67977 <![CDATA[Canvas GetTop and SetTop : Hi All!Did someone get to make...]]> http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67973&title=canvas-gettop-and-settop#67973 Author: Krog
Subject: 19616
Posted: 12 April 2012 at 12:47am

Hi All!

Did someone get to make the Set functions to work?
]]> Thu, 12 Apr 2012 00:47:52 +0000 http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67973&title=canvas-gettop-and-settop#67973 <![CDATA[Canvas GetTop and SetTop : Hi Oleg!I uploaded a program to...]]> http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67899&title=canvas-gettop-and-settop#67899 Author: Krog
Subject: 19616
Posted: 28 March 2012 at 8:09pm

Hi Oleg!

I uploaded a program to test it. I can't move the rectangle and the border inside the canvas using the Set functions.

Here it is:

uploads/3733/TestCanvasSetFunctions.zip

Thanks in advance!

]]> Wed, 28 Mar 2012 20:09:49 +0000 http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67899&title=canvas-gettop-and-settop#67899 <![CDATA[Canvas GetTop and SetTop : Get methods returned void....]]> http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67894&title=canvas-gettop-and-settop#67894 Author: Oleg
Subject: 19616
Posted: 28 March 2012 at 11:07am

Get methods returned void.  Fixed for next relese.  Don't see problem with Set method.  Please write support if try fix.  Give sample on how you use Set so I debug.]]> Wed, 28 Mar 2012 11:07:55 +0000 http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67894&title=canvas-gettop-and-settop#67894 <![CDATA[Canvas GetTop and SetTop : Hi!The functions GetTop, GetLeft,...]]> http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67871&title=canvas-gettop-and-settop#67871 Author: Krog
Subject: 19616
Posted: 27 March 2012 at 11:20pm

Hi!

The functions GetTop, GetLeft, GetRight and GetBottom from the MarkupCanvas object class are implemented as methods (sub) instead of functions. So they don't return the values and then they are useless.

And it appears that the methods SetTop, SetLeft... don't work too. At least for me I can't make them to work at run-time.

Any tips?

]]> Tue, 27 Mar 2012 23:20:01 +0000 http://forum.codejock.com/forum_posts.asp?TID=19616&PID=67871&title=canvas-gettop-and-settop#67871