c# - The wpf controls dose't displaying on the canvas -

-

i inheritance canvas control , create custom canvas class this:

public class mycanvas:canvas {     //this list contains shape     visualcollection graphicslist;     list<graphicsbase> clonegraphicslist;     int c = 0;     double deltax = 0;     double deltay = 0;     public mycanvas()         :base()     {         graphicslist = new visualcollection(this);         clonegraphicslist = new list<graphicsbase>();     }     public visualcollection graphicslist     {                 {             return graphicslist;         }         set         {             graphicslist = value;         }     }      protected override int visualchildrencount     {                 {             return graphicslist.count;         }     }      protected override visual getvisualchild(int index)     {         if (index < 0 || index >= graphicslist.count)         {             throw new argumentoutofrangeexception("index");         }         return graphicslist[index];     }     public graphicsbase this[int index]     {                 {             if (index >= 0 && index < graphicslist.count)             {                 return (graphicsbase)graphicslist[index];             }             return null;         }     }      public int count     {                 {             return graphicslist.count;         }     }  }

and in xaml use code:

<window x:class="mynamespace.mainwindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:customcanvas="clr-namespace:mynamespace" xmlns:wpfruler="clr-namespace:orbifold.wpfruler;assembly=orbifold.wpfruler" title="printvarsdesigner" height="709" width="964" background="lightgray" grid.issharedsizescope="false" overridesdefaultstyle="false"  windowstate="maximized" windowstartuplocation="centerscreen">   <customcanvas:mycanvas x:name="mycanvas" background="white" verticalalignment="top"        width="895" height="1162">   </customcanvas:mycanvas> </window>

the controls does't appear after add visual screen or c# code add child canvas.

thanks advice.

inheriting wpf controls problematic least. wpf control's "lookless". say, control doesn't know how it's going presented. when control placed in window wpf looks corresponding controltemplate specific control.

the problem inherited controls have no such template. if want display it, you'll have write 1 yourself, , that's not simple. can find example here, i'd recommend against it. use usercontrols instead.


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