查找嵌入式 TFrame
Finding an embedded TFrame
我有一个继承自 TBaseFrame 的 TFrame = class(TFrame)
里面有一个具有相同继承关系的嵌入式 TFrame
TViewStandardMovimentoFinanceiro = class(TFrameBase)
ViewStandardEdiMovimentoFinanceiro1: TViewStandardEdiMovimentoFinanceiro;
TViewStandardEdiMovimentoFinanceiro = class(TFrameBase)
TFrameBase = class(TFrame, INaharView, INaharViewAdapter)
创建 TViewStandardMovimentoFinanceiro 时父级设置为主窗体(特别是 THorzScrollBox)
在 TViewStandardMovimentoFinanceiro 框架内,我尝试了 class使用子列表的正常方法,但没有找到嵌入的 TFrame。
我也尝试过使用父子列表,但没有成功。与组件列表相同
我想做的是找到所有可用的 TFrames,这样我就可以请求一个接口(我知道该怎么做)
我错过了什么?
根据以下建议,我已经实施了此代码进行测试:
function TFrameBase.LocateControl(AControl: TControl; ADomainName: string): TControlHandler;
var
NaharView: INaharView;
ControlHandler: TControlHandler;
i: integer;
begin
result := nil;
for i := 0 to AControl.ChildrenCount - 1 do
if (AControl.Children[i] is TFrame) and (AControl.Children[i] <> Self) then
if Supports((AControl.Children[i] as TFrame), INaharView, NaharView) then
begin
ControlHandler := NaharView.Control[ADomainName];
if Assigned(ControlHandler) then
exit(ControlHandler);
end;
end;
function GetUltimateParent(Control: TControl): TControl;
begin
if Control.Parent is TControl then
Result := GetUltimateParent(TControl(Control.Parent))
else
Result := Control;
end;
function TFrameBase.GetNaharControl(ADomainName: string): TControlHandler;
var
i: integer;
ControlHandler: TControlHandler;
begin
if NaharControls.ContainsKey(ADomainName) then
Exit(NaharControls.Items[ADomainName])
else
begin
ControlHandler := LocateControl(GetUltimateParent(Self), ADomainName);
if Assigned(ControlHandler) then
exit(ControlHandler);
end;
raise EViewControlDomainNameNotFound.Create(ADomainName);
end;
当 LocateControl 被执行时,它会到达顶部的几个级别,并从那里尝试迭代子列表,它只包含 3 个项目,在一个充满控件的表单中。
您的函数 LocateControl 需要递归,如 Ondrej 所述。像这样
function TFrameBase.LocateControl(AControl: TControl; ADomainName: string): TControlHandler;
var
NaharView: INaharView;
ControlHandler: TControlHandler;
i: integer;
begin
result := nil;
for i := 0 to AControl.ChildrenCount - 1 do
begin
if (AControl.Children[i] is TFrame) and (AControl.Children[i] <> Self) then
begin
if Supports((AControl.Children[i] as TFrame), INaharView, NaharView) then
begin
ControlHandler := NaharView.Control[ADomainName];
if Assigned(ControlHandler) then
begin
exit(ControlHandler);
end;
end;
end;
// recursive bit
Result := LocateControl(AControl.Children[i], ADomainName):
if assigned( Result ) then
begin
exit;
end;
end;
end;
我有一个继承自 TBaseFrame 的 TFrame = class(TFrame)
里面有一个具有相同继承关系的嵌入式 TFrame
TViewStandardMovimentoFinanceiro = class(TFrameBase)
ViewStandardEdiMovimentoFinanceiro1: TViewStandardEdiMovimentoFinanceiro;
TViewStandardEdiMovimentoFinanceiro = class(TFrameBase)
TFrameBase = class(TFrame, INaharView, INaharViewAdapter)
创建 TViewStandardMovimentoFinanceiro 时父级设置为主窗体(特别是 THorzScrollBox)
在 TViewStandardMovimentoFinanceiro 框架内,我尝试了 class使用子列表的正常方法,但没有找到嵌入的 TFrame。
我也尝试过使用父子列表,但没有成功。与组件列表相同
我想做的是找到所有可用的 TFrames,这样我就可以请求一个接口(我知道该怎么做)
我错过了什么?
根据以下建议,我已经实施了此代码进行测试:
function TFrameBase.LocateControl(AControl: TControl; ADomainName: string): TControlHandler;
var
NaharView: INaharView;
ControlHandler: TControlHandler;
i: integer;
begin
result := nil;
for i := 0 to AControl.ChildrenCount - 1 do
if (AControl.Children[i] is TFrame) and (AControl.Children[i] <> Self) then
if Supports((AControl.Children[i] as TFrame), INaharView, NaharView) then
begin
ControlHandler := NaharView.Control[ADomainName];
if Assigned(ControlHandler) then
exit(ControlHandler);
end;
end;
function GetUltimateParent(Control: TControl): TControl;
begin
if Control.Parent is TControl then
Result := GetUltimateParent(TControl(Control.Parent))
else
Result := Control;
end;
function TFrameBase.GetNaharControl(ADomainName: string): TControlHandler;
var
i: integer;
ControlHandler: TControlHandler;
begin
if NaharControls.ContainsKey(ADomainName) then
Exit(NaharControls.Items[ADomainName])
else
begin
ControlHandler := LocateControl(GetUltimateParent(Self), ADomainName);
if Assigned(ControlHandler) then
exit(ControlHandler);
end;
raise EViewControlDomainNameNotFound.Create(ADomainName);
end;
当 LocateControl 被执行时,它会到达顶部的几个级别,并从那里尝试迭代子列表,它只包含 3 个项目,在一个充满控件的表单中。
您的函数 LocateControl 需要递归,如 Ondrej 所述。像这样
function TFrameBase.LocateControl(AControl: TControl; ADomainName: string): TControlHandler;
var
NaharView: INaharView;
ControlHandler: TControlHandler;
i: integer;
begin
result := nil;
for i := 0 to AControl.ChildrenCount - 1 do
begin
if (AControl.Children[i] is TFrame) and (AControl.Children[i] <> Self) then
begin
if Supports((AControl.Children[i] as TFrame), INaharView, NaharView) then
begin
ControlHandler := NaharView.Control[ADomainName];
if Assigned(ControlHandler) then
begin
exit(ControlHandler);
end;
end;
end;
// recursive bit
Result := LocateControl(AControl.Children[i], ADomainName):
if assigned( Result ) then
begin
exit;
end;
end;
end;