利用uniGUI Frame的机制来搭建项目，是非常好的实现方式，uniGUI的主要Demo就是用这种方式来实现的。
对此，我实现了一个类，来管理Frame的显示。
unit FrameMgn;
interface
uses
System.Classes, System.Contnrs, System.SysUtils, Vcl.Controls, uniGUIFrame, uniGUIClasses;
type
TFrameManager = class(TComponent)
private
FFrameList: TObjectList;
FActiveFrame: TUniFrame;
FContainerPanel: TUniCustomContainerPanel;
procedure SetActiveFrame(const Value: TUniFrame);
procedure SetContainerPanel(const Value: TUniCustomContainerPanel);
function GetEditFrameClassName(aClassName: String): string; // 根据给定的参数,返回对应的编辑Frame的类名.
function GetFrameInstance(aFrameClassName: string): TUniFrame;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure ShowFrame(aClassName: String);
procedure HideFrame;
property ActiveFrame: TUniFrame read FActiveFrame write SetActiveFrame;
property ContainerPanel: TUniCustomContainerPanel read FContainerPanel write SetContainerPanel;
end;
implementation
{ TFrameManager }
uses MainModule;
constructor TFrameManager.Create(AOwner: TComponent);
begin
inherited;
FFrameList := TObjectList.Create;
FFrameList.OwnsObjects := False;
end;
destructor TFrameManager.Destroy;
begin
FFrameList.Free;
inherited;
end;
function TFrameManager.GetEditFrameClassName(aClassName: String): string;
var
cn: String;
begin
Result := aClassName;
if UniMainModule.UserLoginCode <> ‘‘ then // 如果登录状态
begin
cn := aClassName + ‘Edit‘;
if (GetClass(cn) <> nil) and (UniMainModule.FuncList.Locate(‘FAndroid_ClassName‘, cn, [])) then
Result := cn;
end;
end;
function TFrameManager.GetFrameInstance(aFrameClassName: string): TUniFrame;
var
fr: TUniFrame;
frc: TuniFrameClass;
I: Integer;
begin
for I := 0 to FFrameList.Count - 1 do
begin
if CompareText(FFrameList.Items[I].ClassName, aFrameClassName) = 0 then
begin
Result := TUniFrame(FFrameList.Items[I]);
exit;
end;
end;
frc := TuniFrameClass(GetClass(aFrameClassName)); // findClass找不到类会产生异常,所以换用GetClass。
if frc <> nil then
begin
fr := frc.Create(Self.Owner); // frc的Owner必须是TuniForm或TUniFrame
fr.Name := aFrameClassName.Substring(1);
FFrameList.Add(fr);
Result := fr;
end
end;
procedure TFrameManager.HideFrame;
var
I: Integer;
obj: TUniFrame;
begin
if Assigned(ActiveFrame) then
begin
ActiveFrame.Parent := nil; // 可以，但urlFrame不显示内容:利用UniURLFrame.URL属性取代HTML属性解决.
for I := 0 to FFrameList.Count - 1 do
begin
// 如果一个Frame需要重建才能正常显示，则利用Frame.Tag=1来标记要重建.
obj := FFrameList.Items[I] as TUniFrame;
if obj.Tag = 1 then
// if FFrameList.Items[I].ClassName = ‘TYangZhiFuWuFrameEdit‘ then
begin
FreeAndNil(obj);
FFrameList.Delete(I);
exit;
end;
end;
end;
end;
procedure TFrameManager.SetActiveFrame(const Value: TUniFrame);
begin
FActiveFrame := Value;
end;
procedure TFrameManager.SetContainerPanel(const Value: TUniCustomContainerPanel);
begin
FContainerPanel := Value;
end;
procedure TFrameManager.ShowFrame(aClassName: String);
var
fr: TUniFrame;
frc: TuniFrameClass;
cn: string;
begin
// 如果当前显示的Frame正是选择要显示的直接退出.
if Assigned(ActiveFrame) then
if CompareText(aClassName, ActiveFrame.ClassName) = 0 then
exit;
HideFrame;
cn := GetEditFrameClassName(aClassName);
fr := GetFrameInstance(cn);
if fr <> nil then
begin
fr.Align := alClient;
fr.Parent := FContainerPanel;
ActiveFrame := fr;
end;
end;
end.
有了这个类，再显示一个Frame就方便多了。