为什么DrawingArea不重绘？

我有这样的代码在VALA：为什么DrawingArea不重绘？

using Gtk; 

class Elecciones : GLib.Object { 
    private Gtk.Window ventana; 
    private Gtk.Entry partido1; 
    private Gtk.Entry partido2; 
    private Gtk.Entry partido3; 
    private Gtk.DrawingArea tabla; 

    public Elecciones(){ 
      var builder = new Builder(); 
      builder.add_from_file("elecciones.ui"); 
      builder.connect_signals(null); 
      var ventana = builder.get_object("window1") as Window; 
      ventana.title = "Grafico electoral"; 
      ventana.destroy.connect(Gtk.main_quit); 
      var contenedor = builder.get_object("contenedor") as Box; 
      var caja1 = builder.get_object("caja1") as Box; 
      var label1 = builder.get_object("label1") as Label; 
      partido1 = builder.get_object("partido1") as Entry; 
      var caja2 = builder.get_object("caja2") as Box; 
      var label2 = builder.get_object("label2") as Label; 
      partido2 = builder.get_object("partido2") as Entry; 
      var caja3 = builder.get_object("caja3") as Box; 
      var label3 = builder.get_object("partido3") as Label; 
      partido3 = builder.get_object("partido3") as Entry; 
      var boton = builder.get_object("boton") as Button; 
      var tabla = builder.get_object("tabla") as DrawingArea; 

      boton.clicked.connect(()=>{      
        int v1 = int.parse(partido1.get_text()); 
        int v2 = int.parse(partido2.get_text()); 
        int v3 = int.parse(partido3.get_text()); 
        int total = v1+v2+v3; 

        int cuadro1 = v1*200/total; 
        int cuadro2 = v2*200/total; 
        int cuadro3 = v3*200/total; 

        string percent1 = (v1*100/total).to_string(); 
        string percent2 = (v2*100/total).to_string(); 
        string percent3 = (v3*100/total).to_string(); 

        ventana.style_updated(); 
        tabla.draw.connect((context)=>{ 
          weak Gtk.StyleContext style_context = tabla.get_style_context(); 
          int height = tabla.get_allocated_height(); 
          int width = tabla.get_allocated_width(); 

          context.set_source_rgba(0.144360,0.284024,0.839825,1); 
          context.rectangle(30, 0, cuadro1, 100); 
          context.fill(); 
          context.set_source_rgba(1,1,1,1); 
          context.select_font_face("serif",Cairo.FontSlant.NORMAL,Cairo.FontWeight.NORMAL); 
          context.set_font_size(16); 
          context.move_to(35,30); 
          context.show_text(percent1+"%"); 

          context.set_source_rgba(0.980442,0.118050,0.000000,1); 
          context.rectangle(30+cuadro1, 0, cuadro2, 100); 
          context.fill(); 
          context.set_source_rgba(1,1,1,1);   

          context.select_font_face("serif",Cairo.FontSlant.NORMAL,Cairo.FontWeight.NORMAL); 
          context.set_font_size(16); 
          context.move_to(35+cuadro1,30); 
          context.show_text(percent2+"%"); 

          context.set_source_rgba(0,0.980442,0.092757,1); 
          context.rectangle(30+cuadro1+cuadro2,0,cuadro3, 100); 
          context.fill(); 
          context.set_source_rgba(1,1,1,1); 
          context.select_font_face("serif",Cairo.FontSlant.NORMAL,Cairo.FontWeight.NORMAL); 
          context.set_font_size(16); 
          context.move_to(35+cuadro1+cuadro2,30); 
          context.show_text(percent3+"%"); 

          return true; 
        }); 
       }); 

       ventana.show_all(); 
     } 

     public static int main(string[] args) { 
      Gtk.init(ref args); 
      Elecciones elecciones = new Elecciones(); 
      Gtk.main(); 
      return 0; 
     } 
}

这间空地代码：

<?xml version="1.0" encoding="UTF-8"?> 
<!-- Generated with glade 3.16.0 on Mon May 5 18:42:12 2014 --> 
<interface> 
<!-- interface-requires gtk+ 3.10 --> 
<object class="GtkWindow" id="window1"> 
<property name="can_focus">False</property> 
<property name="default_width">300</property> 
<property name="default_height">400</property> 
<child> 
    <object class="GtkBox" id="contenedor"> 
    <property name="visible">True</property> 
    <property name="can_focus">False</property> 
    <property name="orientation">vertical</property> 
    <child> 
     <object class="GtkBox" id="caja1"> 
     <property name="visible">True</property> 
     <property name="can_focus">False</property> 
     <property name="halign">start</property> 
     <property name="margin_top">20</property> 
     <child> 
      <object class="GtkLabel" id="label1"> 
      <property name="visible">True</property> 
      <property name="can_focus">False</property> 
      <property name="halign">start</property> 
      <property name="margin_left">20</property> 
      <property name="hexpand">True</property> 
      <property name="label" translatable="yes">Partido 1: </property> 
      </object> 
      <packing> 
      <property name="expand">False</property> 
      <property name="fill">True</property> 
      <property name="position">0</property> 
      </packing> 
     </child> 
     <child> 
      <object class="GtkEntry" id="partido1"> 
      <property name="visible">True</property> 
      <property name="can_focus">True</property> 
      <property name="halign">start</property> 
      <property name="margin_left">10</property> 
      <property name="margin_right">120</property> 
      <property name="hexpand">True</property> 
      </object> 
      <packing> 
      <property name="expand">False</property> 
      <property name="fill">True</property> 
      <property name="position">1</property> 
      </packing> 
     </child> 
     </object> 
     <packing> 
     <property name="expand">False</property> 
     <property name="fill">True</property> 
     <property name="position">0</property> 
     </packing> 
    </child> 
    <child> 
     <object class="GtkBox" id="caja2"> 
     <property name="visible">True</property> 
     <property name="can_focus">False</property> 
     <property name="halign">start</property> 
     <property name="margin_top">20</property> 
     <child> 
      <object class="GtkLabel" id="label2"> 
      <property name="visible">True</property> 
      <property name="can_focus">False</property> 
      <property name="halign">start</property> 
      <property name="margin_left">20</property> 
      <property name="hexpand">True</property> 
      <property name="label" translatable="yes">Partido 2: </property> 
      </object> 
      <packing> 
      <property name="expand">False</property> 
      <property name="fill">True</property> 
      <property name="position">0</property> 
      </packing> 
     </child> 
     <child> 
      <object class="GtkEntry" id="partido2"> 
      <property name="visible">True</property> 
      <property name="can_focus">True</property> 
      <property name="halign">start</property> 
      <property name="margin_left">10</property> 
      <property name="margin_right">120</property> 
      <property name="hexpand">True</property> 
      </object> 
      <packing> 
      <property name="expand">False</property> 
      <property name="fill">True</property> 
      <property name="position">1</property> 
      </packing> 
     </child> 
     </object> 
     <packing> 
     <property name="expand">False</property> 
     <property name="fill">True</property> 
     <property name="position">1</property> 
     </packing> 
    </child> 
    <child> 
     <object class="GtkBox" id="caja3"> 
     <property name="visible">True</property> 
     <property name="can_focus">False</property> 
     <property name="halign">start</property> 
     <property name="margin_top">20</property> 
     <child> 
      <object class="GtkLabel" id="label3"> 
      <property name="visible">True</property> 
      <property name="can_focus">False</property> 
      <property name="halign">start</property> 
      <property name="margin_left">20</property> 
      <property name="hexpand">True</property> 
      <property name="label" translatable="yes">Partido 3: </property> 
      </object> 
      <packing> 
      <property name="expand">False</property> 
      <property name="fill">True</property> 
      <property name="position">0</property> 
      </packing> 
     </child> 
     <child> 
      <object class="GtkEntry" id="partido3"> 
      <property name="visible">True</property> 
      <property name="can_focus">True</property> 
      <property name="halign">start</property> 
      <property name="margin_left">10</property> 
      <property name="margin_right">120</property> 
      <property name="hexpand">True</property> 
      </object> 
      <packing> 
      <property name="expand">False</property> 
      <property name="fill">True</property> 
      <property name="position">1</property> 
      </packing> 
     </child> 
     </object> 
     <packing> 
     <property name="expand">False</property> 
     <property name="fill">True</property> 
     <property name="position">2</property> 
     </packing> 
    </child> 
    <child> 
     <object class="GtkButton" id="boton"> 
     <property name="label" translatable="yes">Graficar</property> 
     <property name="visible">True</property> 
     <property name="can_focus">True</property> 
     <property name="receives_default">True</property> 
     <property name="halign">start</property> 
     <property name="margin_left">20</property> 
     <property name="margin_top">20</property> 
     <property name="hexpand">True</property> 
     </object> 
     <packing> 
     <property name="expand">False</property> 
     <property name="fill">True</property> 
     <property name="position">3</property> 
     </packing> 
    </child> 
    <child> 
     <object class="GtkDrawingArea" id="tabla"> 
     <property name="visible">True</property> 
     <property name="can_focus">False</property> 
     <property name="margin_top">20</property> 
     <property name="margin_bottom">20</property> 
     </object> 
     <packing> 
     <property name="expand">True</property> 
     <property name="fill">True</property> 
     <property name="position">4</property> 
     </packing> 
    </child> 
    </object> 
</child> 
</object> 
</interface>

当我点击Graficar按钮，它显示出与3个文本输入的百分之一间酒吧。但问题是，当我在任何条目中写入新的百分比并再次单击Graficar按钮时，它不会更新带有新日期的栏。

first click

changed the values second click

来源

2014-05-05 Dominuskernel

所以问题是'Gtk.DrawingArea'没有重绘？您应该编辑问题的标题以使其更有意义（如“为什么DrawingArea不重绘？”），并且还说了几句话，解释为什么您的解决方案可以解决问题。这样，问题+答案将对未来的访问者更有帮助。 –

Finaly我已经解决了这个问题。问题在于我在按钮信号内发送信号Draw。现在我把信号拉到外面，并放置一个处理器（activado），当点击按钮时绘制。这是正确的代码：

using Gtk; 

class Elecciones : GLib.Object { 
private Gtk.Window ventana; 
private Gtk.Entry partido1; 
private Gtk.Entry partido2; 
private Gtk.Entry partido3; 
private Gtk.DrawingArea tabla; 
private bool activado = false; 

public Elecciones(){ 
    var builder = new Builder(); 
    builder.add_from_file("elecciones.ui"); 
    builder.connect_signals(null); 
    var ventana = builder.get_object("window1") as Window; 
    ventana.title = "Grafico electoral"; 
    ventana.destroy.connect(Gtk.main_quit); 
    var contenedor = builder.get_object("contenedor") as Box; 
    var caja1 = builder.get_object("caja1") as Box; 
    var label1 = builder.get_object("label1") as Label; 
    partido1 = builder.get_object("partido1") as Entry; 
    var caja2 = builder.get_object("caja2") as Box; 
    var label2 = builder.get_object("label2") as Label; 
    partido2 = builder.get_object("partido2") as Entry; 
    var caja3 = builder.get_object("caja3") as Box; 
    var label3 = builder.get_object("partido3") as Label; 
    partido3 = builder.get_object("partido3") as Entry; 
    var boton = builder.get_object("boton") as Button; 
    var tabla = builder.get_object("tabla") as DrawingArea; 
    boton.clicked.connect(()=>{ 
    activado = true; 
    ventana.style_updated(); 
    }); 
    tabla.visible = true; 
    tabla.draw.connect((context)=>{ 
    if(activado==true){ 
     weak Gtk.StyleContext style_context = tabla.get_style_context(); 
     int height = tabla.get_allocated_height(); 
     int width = tabla.get_allocated_width(); 
     int v1 = int.parse(partido1.get_text()); 
     int v2 = int.parse(partido2.get_text()); 
     int v3 = int.parse(partido3.get_text()); 
     int total = v1+v2+v3; 
     int cuadro1 = v1*200/total; 
     int cuadro2 = v2*200/total; 
     int cuadro3 = v3*200/total; 
     string percent1 = (v1*100/total).to_string(); 
     string percent2 = (v2*100/total).to_string(); 
     string percent3 = (v3*100/total).to_string(); 
     context.set_source_rgba(0.144360,0.284024,0.839825,1); 
     context.rectangle(30, 0, cuadro1, 100); 
     context.fill(); 
     context.set_source_rgba(1,1,1,1); 
     context.select_font_face("serif",Cairo.FontSlant.NORMAL,Cairo.FontWeight.NORMAL); 
     context.set_font_size(16); 
     context.move_to(35,30); 
     context.show_text(percent1+"%"); 
     context.set_source_rgba(0.980442,0.118050,0.000000,1); 
     context.rectangle(30+cuadro1, 0, cuadro2, 100); 
     context.fill(); 
     context.set_source_rgba(1,1,1,1); 
     context.select_font_face("serif",Cairo.FontSlant.NORMAL,Cairo.FontWeight.NORMAL); 
     context.set_font_size(16); 
     context.move_to(35+cuadro1,30); 
     context.show_text(percent2+"%"); 
     context.set_source_rgba(0,0.980442,0.092757,1); 
     context.rectangle(30+cuadro1+cuadro2,0,cuadro3, 100); 
     context.fill(); 
     context.set_source_rgba(1,1,1,1); 
     context.select_font_face("serif",Cairo.FontSlant.NORMAL,Cairo.FontWeight.NORMAL); 
     context.set_font_size(16); 
     context.move_to(35+cuadro1+cuadro2,30); 
     context.show_text(percent3+"%"); 
    } 
    return true; 
    }); 
    tabla.queue_draw(); 
    ventana.show_all(); 
} 
public static int main(string[] args) { 
    Gtk.init(ref args); 
    Elecciones elecciones = new Elecciones(); 
    Gtk.main(); 
    return 0; 
} 
}

来源

2014-05-05 20:39:14 Dominuskernel

为什么DrawingArea不重绘？

回答

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