控制uniFrame显示的一个管理类

(2016-03-29 06:41:17)

标签：

delphi

分类： uniGUI

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。

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