感谢您的提示。 Open Tools API 是一种可行的方法,并且可以在设计时从表单上的组件中使用 Open Tools API。
所以这是我的解决方案:
我需要两个单元,一个用于组件,一个用于注册组件和使用 Open Tools API 的代码。
组件单元来了:
unit TestLabels;
interface
uses
SysUtils, Classes, Windows, Controls, StdCtrls;
type
TTestLabel = class(TLabel)
private
FTestProperty: Boolean;
procedure SetTestProperty(const Value: Boolean);
procedure Changed;
published
property TestProperty: Boolean read FTestProperty write SetTestProperty;
end;
var
OnGetUnitPath: TFunc;
implementation
{ TTestLabel }
procedure TTestLabel.Changed;
begin
if not (csDesigning in ComponentState) then
Exit; // I only need the path at designtime
if csLoading in ComponentState then
Exit; // at this moment you retrieve the unit path which was current before
if not Assigned(OnGetUnitPath) then
Exit;
// only for demonstration
Caption := OnGetUnitPath;
MessageBox(0, PChar(ExtractFilePath(OnGetUnitPath)), 'Path of current unit', 0);
end;
procedure TTestLabel.SetTestProperty(const Value: Boolean);
begin
if FTestProperty Value then
begin
FTestProperty := Value;
Changed;
end;
end;
end.
这里是注册组件和调用 Open Tools API 的单元:
unit TestLabelsReg;
interface
uses
SysUtils, Classes, Controls, StdCtrls, TestLabels;
procedure register;
implementation
uses
ToolsAPI;
function GetCurrentUnitPath: String;
var
ModuleServices: IOTAModuleServices;
Module: IOTAModule;
SourceEditor: IOTASourceEditor;
idx: integer;
begin
Result := '';
SourceEditor := nil;
if SysUtils.Supports(BorlandIDEServices, IOTAModuleServices,
ModuleServices) then
begin
Module := ModuleServices.CurrentModule;
if System.Assigned(Module) then
begin
idx := Module.GetModuleFileCount - 1;
// Iterate over modules till we find a source editor or list exhausted
while (idx >= 0) and not SysUtils.Supports(Module.GetModuleFileEditor(idx), IOTASourceEditor, SourceEditor) do
System.Dec(idx);
// Success if list wasn't ehausted.
if idx >= 0 then
Result := ExtractFilePath(SourceEditor.FileName);
end;
end;
end;
procedure register;
begin
RegisterComponents('Samples', [TTestLabel]);
TestLabels.OnGetUnitPath := GetCurrentUnitPath;
end;
end.