Лидеры

Для одного проекта писал такое пару месяцев назад, пользуйтесь.Под windows, при клике на сообщение, оно превращается в readonly TMemo - дабы можно было скопировать нужное из сообщения. При наличии URL в сообщении, сбоку появляется кнопка открыть - лучше ничего для открытия ссылок не придумал. Надо бы сделать диалог выбора для открытия одной из нескольких ссылок, но руки пока не доходят. Пощупать чат вживую можно в приложении https://play.google.com/store/apps/details?id=ru.flintnet.InternetAgent , для активации и загрузки примера чата отсканируйте приложением qr-код с страницы http://internetagent.flintnet.ru/ unit ChatBox; interface uses System.SysUtils, System.Classes, FMX.Types, FMX.Controls, FMX.Layouts,System.Types, FMX.StdCtrls,FMX.Edit,FMX.Memo,FMX.TextLayout,System.UITypes,FMX.Graphics,FMX.Objects, FMX.Effects,FMX.Styles.Objects; type TMessagePos = (msgLeft,msgRight); TEventText = procedure(PURL: String) of object; TChatBox = class(TVertScrollBox) private FTextLyout : TTextLayout; FLastMessageId : Integer; FMsgWidthPercentage : Integer; FOnURLButtonClick : TEventText; FCalloutLength : Single; FCalloutXRadius : Single; FCalloutYRadius : Single; FMessageFontSize : Single; FMemo : TMemo; procedure ButtonClick(Sender: TObject); procedure MyMsgContainerOnClick(Sender: TObject); procedure MyMsgContainerOnExit(Sender: TObject); function FCreateMsgBlock(AOwner: TComponent; PMessageId : Integer; PDate, PAutor, PMessage : String; PMessagePos : TMessagePos) : TLayout; function CalculateTextItemHeight(Sender: TObject) : Single; procedure LayoutResize(Sender: TObject); function ExtractURL(pString : String) : String; procedure Memo1ApplyStyleLookup(Sender: TObject); public property LastMessageId : Integer read FLastMessageId; property MsgWidthPercentage : Integer read FMsgWidthPercentage write FMsgWidthPercentage default 80; constructor Create(AOwner: TComponent); override; destructor Destroy; override; Procedure AddMessage(pMessageId : Integer; PDate, PAutor, PMessage : String; PMessagePos : TMessagePos); procedure ClearChildren(AChatBox: TChatBox); procedure ScrollBottomSmoothly; procedure ScrollBottom; published property OnURLButtonClick : TEventText read FonURLButtonClick write FonURLButtonClick; property CalloutLength : Single read FCalloutLength write FCalloutLength; property CalloutXRadius : Single read FCalloutXRadius write FCalloutXRadius; property CalloutYRadius : Single read FCalloutYRadius write FCalloutYRadius; property MessageFontSize : Single read FMessageFontSize write FMessageFontSize; end; TOpenChatBox = class(TChatBox); Procedure Register; implementation procedure Register; begin RegisterComponents('EKorepov', [TChatBox]); end; constructor TChatBox.Create(AOwner: TComponent); begin inherited create(Aowner); FLastMessageId:=-1; FTextLyout := TTextLayoutManager.DefaultTextLayout.Create; FMemo:=TMemo.Create(Aowner); FMemo.TextSettings.WordWrap:=True; FMemo.ReadOnly:=True; FMemo.Align:=TAlignLayout.Client; FMemo.OnExit:=MyMsgContainerOnExit; FMemo.OnApplyStyleLookup:=Memo1ApplyStyleLookup; FMemo.StyledSettings:=FMemo.StyledSettings-[TStyledSetting.Size]; With Self as TVertScrollBox do begin AniCalculations.Animation := True; AniCalculations.BoundsAnimation := True; AniCalculations.TouchTracking := [ttVertical]; end; end; destructor TChatBox.Destroy; begin FreeAndNil(FMemo); FreeAndNil(FTextLyout); inherited Destroy; end; procedure TChatBox.ScrollBottomSmoothly; begin AniCalculations.MouseWheel(0, ContentBounds.Height+5); end; procedure TChatBox.ScrollBottom; begin ScrollBy(0, -ContentBounds.Height); end; procedure TChatBox.ButtonClick(Sender: TObject); Var URL : String; begin URL:=TButton(Sender).HelpKeyword; if Assigned(FonURLButtonClick) then FonURLButtonClick(URL); end; procedure TChatBox.Memo1ApplyStyleLookup(Sender: TObject); begin end; procedure TChatBox.MyMsgContainerOnClick(Sender: TObject); begin FMemo.TextSettings:=TLabel(Sender).TextSettings; FMemo.Lines.Text:=TLabel(Sender).Text; TLabel(Sender).AddObject(FMemo); end; procedure TChatBox.MyMsgContainerOnExit(Sender: TObject); begin if (Sender is TMemo) then if Assigned(TMemo(Sender).Parent) then if (TMemo(Sender).Parent is TLabel) then TLabel(TMemo(Sender).Parent).RemoveObject(TMemo(Sender)); end; procedure TChatBox.ClearChildren(AChatBox: TChatBox); begin Assert(AChatBox <> nil); TOpenChatBox(AChatBox).Content.DeleteChildren; AChatBox.Repaint; end; function TChatBox.CalculateTextItemHeight(Sender: TObject) : Single; var Item: TLabel; begin Result:=0; if (Sender is TLabel) then begin Item := TLabel(Sender); FTextLyout.BeginUpdate; try FTextLyout.Text := Item.Text; FTextLyout.MaxSize := TPointF.Create(Item.Width-Item.Margins.Left-Item.Margins.Right-10, 1000); FTextLyout.Font := Item.Font; FTextLyout.WordWrap:= Item.WordWrap; FTextLyout.HorizontalAlign:= Item.TextSettings.HorzAlign; FTextLyout.VerticalAlign:= Item.TextSettings.VertAlign; finally FTextLyout.EndUpdate; end; Result:= FTextLyout.Height+10; end; end; procedure TChatBox.LayoutResize(Sender: TObject); Var Item : TLabel; CalloutRectangle : TCalloutRectangle; Layout : TLayout; I : Integer; begin Layout:=TLayout(Sender); for I := 0 to Layout.Children.Count-1 do begin If Layout.Children.Items[I] is TCalloutRectangle Then begin CalloutRectangle:=TCalloutRectangle(Layout.Children.Items[I]); Item:=TLabel(CalloutRectangle.Children.Items[0]); CalloutRectangle.Width:=(Layout.Width / 100) * FMsgWidthPercentage; Layout.Height:=CalculateTextItemHeight(Item); end; If Layout.Children.Items[I] is TButton Then begin TButton(Layout.Children.Items[I]).Width:=(Layout.Width / 100) * (100-FMsgWidthPercentage-5); end; end; end; Procedure TChatBox.AddMessage(pMessageId : Integer; PDate, PAutor, PMessage : String; PMessagePos : TMessagePos); Var lcLayout : TLayout; begin PDate:=Trim(PDate); PAutor:=Trim(PAutor); PMessage:=Trim(PMessage); FLastMessageId:=PMessageId; lcLayout:=FCreateMsgBlock((Self as TVertScrollBox), PMessageId, PDate, PAutor, PMessage, PMessagePos); Self.AddObject(lcLayout); end; function TChatBox.FCreateMsgBlock(AOwner: TComponent; PMessageId : Integer; PDate, PAutor, PMessage : String; PMessagePos : TMessagePos) : TLayout; Var lcLayout,lcLayout2 : TLayout; Item : TLabel; Button : TButton; CalloutRectangle : TCalloutRectangle; lcHeight : Single; URL : String; begin lcLayout:=TLayout.Create(AOwner); lcLayout.Tag:=pMessageId; lcLayout.Align:=TAlignLayout.Top; lcLayout.Width:=200; lcLayout.Position.X:=0; lcLayout.Position.Y:= ((AOwner as TVertScrollBox).ContentBounds.Height+10); lcLayout.Margins.Bottom:=10; CalloutRectangle:=TCalloutRectangle.Create(lcLayout); CalloutRectangle.XRadius:=FCalloutXRadius; CalloutRectangle.YRadius:=FCalloutYRadius; CalloutRectangle.CalloutWidth:=10; CalloutRectangle.CalloutOffset:=-3-FCalloutYRadius-CalloutRectangle.CalloutWidth; CalloutRectangle.Width:=((AOwner as TVertScrollBox).Width / 100) * FMsgWidthPercentage; CalloutRectangle.HitTest:=False; case PMessagePos of msgRight : begin CalloutRectangle.Align:=TAlignLayout.Right; CalloutRectangle.CalloutPosition:=TCalloutPosition.Right; CalloutRectangle.Padding.Right:=CalloutRectangle.CalloutLength+CalloutRectangle.XRadius; CalloutRectangle.Padding.Left:=CalloutRectangle.XRadius; end; msgLeft : begin CalloutRectangle.Align:=TAlignLayout.Left; CalloutRectangle.CalloutPosition:=TCalloutPosition.Left; CalloutRectangle.Padding.Left:=CalloutRectangle.CalloutLength+CalloutRectangle.XRadius; CalloutRectangle.Padding.Right:=CalloutRectangle.XRadius; end; end; CalloutRectangle.Padding.Top:=1; CalloutRectangle.Padding.Bottom:=1; lcLayout.AddObject(CalloutRectangle); Item:=TLabel.Create(CalloutRectangle); Item.TextSettings.Font.Size:=MessageFontSize; CalloutRectangle.AddObject(Item); Item.Align:=TAlignLayout.Client; {$IFDEF MSWINDOWS} Item.OnClick:=MyMsgContainerOnClick; {$ENDIF MSWINDOWS} Item.Text:=PDate+' '+PAutor+#10+PMessage; Item.HitTest:=True; Item.WordWrap:=True; lcHeight:=CalculateTextItemHeight(Item); lcLayout.Height:=lcHeight; URL:=ExtractURL(pMessage); Item.StyledSettings:=Item.StyledSettings- [TStyledSetting.Size,TStyledSetting.Style]; if Not URL.IsEmpty then begin lcLayout2:=TLayout.Create(lcLayout); lcLayout2.Align:=TAlignLayout.Client; lcLayout2.Margins.Left:=5; lcLayout2.Margins.Right:=5; lcLayout.AddObject(lcLayout2); Button:=TButton.Create(lcLayout2); Button.Text:='Открыть'; Button.Align:=TAlignLayout.Center; Button.HelpKeyword:=URL; Button.OnClick:=ButtonClick; lcLayout2.AddObject(Button); end; lcLayout.OnResize:=LayoutResize; Result:=lcLayout; end; function TChatBox.ExtractURL(pString : String) : String; Var S : String; begin Result:=''; if Not pString.Contains('http') then Exit; S:=pString.Substring(Pos('http',pString)-1); S:=S.Remove(S.IndexOfAny([' ',','])); Result:=S.TrimRight(['.']); end; end.