iterate through components on a form
(in this case looking only for TMenuItem components)
function TMainForm.IsDuplicateMenuName(name: String): Boolean;
//iterate through all existing menu items looking for the name passed in.
//If it already exists, then return False. Otherwise return True...
var
idx: Integer;
temp : TComponent;
begin
Result := True;
for idx := 0 to (ComponentCount - 1) do
begin
temp := Components[idx];
if (temp is TMenuItem) then
begin
if UpperCase(TMenuItem(Temp).Name) = UpperCase(name) then
Result := False;
end;
end;
end;
************************************************************************************
Note: a generalised VISUAL BASIC equivalent of the code in the for loop
above will look like this:
for each Control in FormName.Controls
'process object
next Control
[neat...]
************************************************************************************
here we iterate through the pages on a PageControl
after all of these pages have been created dynamically
///////////////////////////////////////////////////////
procedure TStepPropertiesForm.FormShow(Sender: TObject);
var
idx: Integer;
entityName: String;
tab: TTabsheet;
ctrlIdx: Integer;
containerNo: Integer;
begin
StepNameEdit.Text := ListsManager.GetStepName(currStepIdx);
StepDescripEdit.Text := ListsManager.GetStepDescription(currStepIdx);
//note that we will not know how many pages (ie PageControls) the
//step properties form should include until after this program has
//loaded up and got it's data from the middle tier
containerNo := 0;
for idx := 2 to (StepPropsPageControl.PageCount - 1) do
begin
tab := StepPropsPageControl.Pages[idx];
for ctrlIdx := 0 to (tab.ControlCount - 1) do
begin
if tab.Controls[ctrlIdx] is TImage then
begin
entityName := ListsManager.GetStepEntityContainerName(currStepIdx, containerNo);
DrawObj.GetBitMap(tempBitMap, entityName, entityImageWidth, entityImageHeight);
FillTempBitMap(clBtnFace);
(tab.Controls[ctrlIdx] as TImage).Picture.Assign(tempBitMap);
end;
end;
Inc(containerNo);
end;
end;