windows phone - How to accessicon from images using position in XAML style sheet -

-

how accessicon images using position in xaml style sheet

like have below image , want access icon @ 2 row , 2 column

by using xaml style sheet idea.

http://www.evohosting.co.uk/blog/wp-content/uploads/2011/07/blue.jpg

thank you

that image not conducive being split (some of shadows overlap icons below), if want can:

  1. create class has method returns icon icon sheet given row , column
  2. create converter calls method , use source binding of image.

this class takes source image , width , height of each icon. given row , column index, geticon function calculates x , y position of icon , returns croppedbitmap containing icon. icons ask cached don't end creating same icon multiple times.

public class iconsheet {     public bitmapimage sheetsource;      private int iconwidth, iconheight;      private dictionary<tuple<int, int>, croppedbitmap> cache =                     new dictionary<tuple<int, int>, croppedbitmap>();      public iconsheet( bitmapimage sheetsource, int iconwidth, int iconheight )     {         sheetsource = sheetsource;         this.iconwidth = iconwidth;         this.iconheight = iconheight;     }      public bitmapsource geticon( int row, int column )     {         var key = tuple.create( row, column );         if( !cache.containskey( key ) )         {             cache.add( key, new croppedbitmap( sheetsource, new int32rect(                     column * iconwidth, row * iconheight, iconwidth, iconheight ) ) );         }         return cache[key];     } }

next create ivalueconverter takes iconsheet value , row , column parameter (formatted string "row,col"). calls geticon method row , column returns bitmapsource can use source of our image.

[valueconversion( typeof( bitmapimage ), typeof( bitmapsource ) )] public class iconsheetindexer : ivalueconverter {     public object convert( object value, type targettype, object parameter, system.globalization.cultureinfo culture )     {         var iconsheet = (value iconsheet);         var coords = (parameter string).split( ',' ).select( s => int.parse( s.trim() ) ).tolist();         return iconsheet.geticon( coords[0], coords[1] );     }      public object convertback( object value, type targettype, object parameter, system.globalization.cultureinfo culture )     {         return null;     } }

in xaml, we'll define 3 parameters our constructor takes - icon sheet bitmapimage , width , height of each icon. we'll define converter resource.

<window.resources>     <bitmapimage x:key="iconsheetsource" urisource="blue.jpg" />     <sys:int32 x:key="iconwidth">95</sys:int32>     <sys:int32 x:key="iconheight">95</sys:int32>     <local:iconsheetindexer x:key="iconsheetindexer"/> </window.resources>

in code-behind, create iconsheet using parameters defined in xaml resources:

public partial class mainwindow : window {     public iconsheet iconsheet { get; private set; }     public mainwindow()     {         initializecomponent();          iconsheet = new iconsheet( this.findresource( "iconsheetsource" ) bitmapimage,             (int)this.findresource( "iconwidth" ),             (int)this.findresource( "iconheight" ) );          this.datacontext = this;     } }

then if want use, example, icon @ row 1, column 3:

<image source="{binding iconsheet, converter={staticresource iconsheetindexer}, converterparameter='1,3'}" stretch="none"/>

results (as uniformgrid each of 16 icons bound image):

example app


Comments

Post a Comment

Popular posts from this blog

java - activate/deactivate sonar maven plugin by profile? -

-
i use sonar plugin executes if activated in maven profile. sonar runs on every compile. the problem build fail other team members not have sonar application installed locally. pom.xml checked in team members same copy including sonar configuration, don't want them modify purpose of disabling sonar (they might inadvertently check modified copy in). please advise how configure maven (.m2/settings.xml) and/or pom.xml sonar feature can enabled/disabled local profile. here sonar configuration in each project's pom.xml: <plugin> <groupid>org.codehaus.mojo</groupid> <artifactid>sonar-maven-plugin</artifactid> <version>1.0</version> <executions> <execution> <id>make-sonar</id> <phase>compile</phase> <goals> <goal>sonar</goal> </goals> </execution> </executions> ...
Read more

python - TypeError: can only concatenate tuple (not "float") to tuple -

-
i'm new python, question might easy, anyway, patience: as trying call newton-raphson method calculate implied volatility in black-scholes formula call/put option pricing, first thing is, newton method in scipy.optimize seems calculate function's zeros, in black-scholes formula, want function's value option price, not zero. (i'm new here programming, i'm not sure techniques.) should write function things like: def f(sigma, price): return bsformula(s0,k,r,t,q,sigma) - price then, while calling newton method, takes args=() 1 parameter in function, write this: value = newton(bsprice2, 0.5, args=price) but error message: file "bs.py", line 36, in bsimpvol value = newton(bsprice2, 0.5, args=float(price)) file "/usr/lib/python2.7/dist-packages/scipy/optimize/zeros.py", line 143, in newton q0 = func(*((p0,) + args)) typeerror: can concatenate tuple (not "float") tuple could tell me why that? how fix it? apprecia...
Read more

java - What is the difference between String. and String.this. ? -

-
this question has answer here: meaning of .this , .class in java 2 answers i'll straight point. im still learning bit of syntax , want know difference between code is code a: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.valueof(i))); } } please ignore fact i undeclared, not lost. code b: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.this.charat(i))); } } what don't yet understand difference in typing string.this , string. i under assumption when use dot operator on class accessing it's static methods(and/or variables if they're not hidden). i have studied little bit , have concluded when using string. accessing string static methods.. when using string.this. i'm accessing methods class buttonz extendi...
Read more