For some reason, I wanted to experiment with a transparent window in WPF earlier, along with a custom opacitymask. (I think someone on twitter said something that made me want to throw together something, but by the time I was done, I had forgotten what!).

So, here’s what I created:

<Window x:Class="TransparentExample.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    WindowStyle="None"
    Title="Window1" Height="450" Width="450" AllowsTransparency="True" Background="Transparent" >
    <Grid Background="Transparent"  >
        <Ellipse Fill="Black" x:Name="ellipse" MouseDown="Ellipse_MouseDown" Stroke="Black" StrokeThickness="8" >
            <Ellipse.OpacityMask>
                <RadialGradientBrush x:Name="opacBrush">
                        <GradientStop Offset=".2" Color="#01000000"></GradientStop>
                        <GradientStop Offset="1" Color="#ff000000"></GradientStop>
                </RadialGradientBrush>
            </Ellipse.OpacityMask>    
            <Ellipse.BitmapEffect>
                <BlurBitmapEffect ></BlurBitmapEffect>
            </Ellipse.BitmapEffect>
        </Ellipse>        
    </Grid>
</Window>

Nothing too shocking there. The ellipse has an opacity mask set to a radial gradient brush. Then, in the mouse down event, I’ve adjusted the origin of the gradient to the the point where the mouse was pressed (and then allow the window to be dragged).

private void Ellipse_MouseDown(object sender, MouseButtonEventArgs e)
{
    if (e.LeftButton == MouseButtonState.Pressed)
    {
        Point pnt = e.GetPosition(null);
        pnt.X = pnt.X / ellipse.ActualWidth ;
        pnt.Y = pnt.Y / ellipse.ActualHeight;
        opacBrush.GradientOrigin = pnt;

        this.DragMove();
    }
}

One thing that stumped me was DragMove. I had put it at the top of the function initially, and couldn’t understand why calls to GetPosition were always returning a 0,0. Finally, it dawned on me that DragMove must be causing it. As soon as it was moved to the last function, everything worked.

The sample code closes the window when the escape key is pressed.

 

Download it.

Cool news for Windows Mobile 7 – it will support Silverlight 3.0 out of the box (although I hope it’s updated to reflect whatever version is current at the time WinMo7 finally ships).

That still gives phone vendors an opportunity to support Flash before these phones ship though.I’m open to anything decent that brings some consistency to the programming model across phones. Maybe HTML 5 will eventually do that – when all of the mobile browsers support it (not to mention their desktop counterparts).

From Ajaxian:

Gmail Mobile team talks Latency and Code Loading

Another one from Microsoft:

Doloto on DevLabs

No big surprise, but Oslo, once part of a giant wave of convoluted functionality, new languages, and other assorted pieces, is changing. Not that you’ll actually get a better understanding of what it is by reading the post – just know that the teams are merging.

Maybe they’ll figure out what it they’re building eventually, and just maybe, they’ll consider that there’s more than 2 types of applications out there that should be considered (photo viewers and RSS readers). :)

I still won’t be shocked if it further disappears from the technology stack.

What’s your take on Oslo’s future?

Take a look at the 428+ ways you can write the classic C “Hello World”  at the Hello World Collection.

 

There’s C#

// Hello World in Microsoft C# ("C-Sharp").

using System;

class HelloWorld
{
    public static int Main(String[] args)
    {
        Console.WriteLine("Hello, World!");
        return 0;
    }
}

Python

# Hello World in Python
print "Hello World"

Good old QuickBASIC:

REM Hello World in QuickBASIC
PRINT "Hello World!"
END

XSLT

<?xml version="1.0" encoding="UTF-8"?>
<!-- Hello World in XSLT -->
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:template match="/">
        <xsl:text>Hello World!</xsl:text>
    </xsl:template>
</xsl:stylesheet>

And even Commodore-64 assembler:

; Hello World for 6502 Assembler (C64)

ldy #0
beq in
loop:
jsr $ffd2
iny
in:
lda hello,y
bne loop
rts
hello: .tx "Hello World!"
       .by 13,10,0

Do you know any languages that aren’t listed (non-proprietary of course).