Inheriting from a component and showing the result in the designer?

Inheriting from a component and showing the result in the designer?

• trager

  Setting Tools->Options->WinformsDesigner->AutoToolboxPopulate causes that VS2005 RTM seems unstable for a seconds; the cursor begins to blink and sometimes this’operation take a "big time". But... this suggestion works.
  
  Regards
  

• sakifcy

  Benjamin Wulfe - MS wrote:

  1.  I *believe* (though I cannot confirm at the moment) that "auto toolbox generation" is by default turned off for this profile.  You can change this in Tools->Options->WinformsDesigner->AutoToolboxPopulate

  That was it! Thanks Benjamin & Tabas. After activating AutoToolboxPopulate it worked perfectly. I wasn't able to add the control manually with "Choose Items" before, but now it's displayed perfectly fine in the designer.
  
  here's the C++/CLR code:
  
      public interface class IAsLVItem{
      public: inline Windows::Forms::ListViewItem ^asItem(void);
      };
  
      public ref class ddlListView :    public Windows::Forms::ListView
      {
      public:
          ddlListView(void){}
          inline void AddList(Collections::ArrayList ^itemlist){
              Windows::Forms::ListViewItem ^item = gcnew Windows::Forms::ListViewItem();
              bool isUnique;
              for(int idx=0;idx<itemlist->Count;idx++){
                  item = ((IAsLVItem ^)itemlist[idx])->asItem();
                  isUnique = true;
                  for(int j=0;j < this->Items->Count;j++){
                      if(this->Items[j]->Name->Equals(item->Name)){
                          isUnique = false;
                          for (int k=0;k<this->Items[j]->SubItems->Count;k++){
                              this->Items[j]->SubItems[k]->Text = item->SubItems[k]->Text;
                          }
                          break;
                      }
                  }
                  if(isUnique) this->Items->Add(item);
              }
          }
          inline void AddItem(IAsLVItem ^itemobj){
              Windows::Forms::ListViewItem ^item = gcnew Windows::Forms::ListViewItem();
              bool isUnique = true;
              item = itemobj->asItem();
              for(int idx=0;idx < this->Items->Count;idx++){
                  if(this->Items[idx]->Name->Equals(item->Name)){
                      isUnique = false;
                      for (int j=0;j<this->Items[idx]->SubItems->Count;j++){
                          this->Items[idx]->SubItems[j]->Text = item->SubItems[j]->Text;
                      }
                      break;
                  }
              }
              if(isUnique) this->Items->Add(item);
          }
          inline void UpdateItem(IAsLVItem ^itemobj){
              Windows::Forms::ListViewItem ^item = gcnew Windows::Forms::ListViewItem();
              item = itemobj->asItem();
              for(int idx=0;idx < this->Items->Count;idx++){
                  if(this->Items[idx]->Name->Equals(item->Name)){
                      for (int j=0;j<this->Items[idx]->SubItems->Count;j++){
                          this->Items[idx]->SubItems[j]->Text = item->SubItems[j]->Text;
                      }
                      break;
                  }
              }
          }
          inline void CheckWithList(Collections::ArrayList ^itemlist){
              Windows::Forms::ListViewItem ^item = gcnew Windows::Forms::ListViewItem();
              bool isObsolete;
              for (int idx=(this->Items->Count - 1);idx>=0;idx--){
                  isObsolete = true;
                  for (int j=0;j<itemlist->Count;j++){
                      item = ((IAsLVItem ^)itemlist[j])->asItem();
                      if(this->Items[idx]->Name->Equals(item->Name)){
                          isObsolete=false;
                          break;
                      }
                  }
                  if(isObsolete) this->Items->RemoveAt(idx);
              }
          }
      };
  
  Edit: Looks like this forum doesn't like the letter 'i' in square brackets... hope I didn't forget to change any i's when copying the code.
  
  
  

• ThomasBear

  Never used C++ Express, but in C# you'd do this.
  
  1) Right click on your project, click Add->Add User Control (note: NOT Inherited Control)
  2) Name it whatever you want, say "NamedUserControl" for the purposes of this list.
  3) In the code behind for the control, replace "NamedUserControl : System.Windows.Forms.UserControl" with "NamedUserControl : ListView"
  4) Compile
  5) Goto the form designer for some form you want to add this too, whatever form, just not the NamedUserControl.
  6) Click on the ToolBox, click on the tab (usualy the first one) that says "My User Controls"
  7) NamedUserControl should appear in that list, and you should be able to drag and drop it onto your form/control/whatever it is you want to add this custom control too.
  
  You can now add whatever new properties and functionality you want to, however you want to be able to "redraw" anything regarding the control.
  
  
  

• Kamal Hathi

  There are two things you should know about using the VC++ profile.
  
  1.  I *believe* (though I cannot confirm at the moment) that "auto toolbox generation" is by default turned off for this profile.  You can change this in Tools->Options->WinformsDesigner->AutoToolboxPopulate
  
  2.  When you add a custom control that appears elsewhere in your form, the designer does not automatically add a reference to the header file at the top.  This will cause your project not to build.  We will fix this in a future version.
  
  There should be nothing stopping you from going into "Choose Items" on the toolbox and manually adding your control.  If you cannot do this, can you post the code for your listview
  
  
  
• Inheriting from a component and showing the result in the designer?