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TreeViewBallon.pas
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TreeViewBallon.pas
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unit TreeViewBallon;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ComCtrls, Vcl.ExtCtrls;
type
TfrmMain = class(TForm)
TreeView1: TTreeView;
btGerarTreeView: TButton;
btGerarTreeViewImage: TButton;
btImagemBallon: TButton;
procedure btGerarTreeViewClick(Sender: TObject);
procedure btGerarTreeViewImageClick(Sender: TObject);
procedure btImagemBallonClick(Sender: TObject);
private
procedure GerarTreeView;
procedure TreeView1CustomDrawItem_Ballon(Sender: TCustomTreeView; Node: TTreeNode;
State: TCustomDrawState; var DefaultDraw: Boolean);
procedure TreeView1CustomDrawItem_Image(Sender: TCustomTreeView; Node: TTreeNode;
State: TCustomDrawState; var DefaultDraw: Boolean);
procedure TreeView1CustomDrawItem_Image_Ballon(Sender: TCustomTreeView; Node: TTreeNode;
State: TCustomDrawState; var DefaultDraw: Boolean);
public
{ Public declarations }
end;
var
frmMain: TfrmMain;
implementation
{$R *.dfm}
procedure TfrmMain.btGerarTreeViewClick(Sender: TObject);
begin
TreeView1.OnCustomDrawItem := TreeView1CustomDrawItem_Ballon;
GerarTreeView;
end;
procedure TfrmMain.btGerarTreeViewImageClick(Sender: TObject);
begin
TreeView1.OnCustomDrawItem := TreeView1CustomDrawItem_Image;
GerarTreeView;
end;
procedure TfrmMain.btImagemBallonClick(Sender: TObject);
begin
TreeView1.OnCustomDrawItem := TreeView1CustomDrawItem_Image_Ballon;
GerarTreeView;
end;
procedure TfrmMain.GerarTreeView;
function Randomstring(strLen: Integer): string;
var
str: string;
begin
if strLen = 0 then
strLen := 1;
str := 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW XYZ';
Result := '';
repeat
Result := Result + str[Random(Length(str)) + 1];
until (Length(Result) = strLen)
end;
Var
Node, NodeChild: TTreeNode;
i, j, k, r: Integer;
sString: String;
begin
TreeView1.Items.Clear;
TreeView1.Items.BeginUpdate;
try
for i := 1 to 5 do
begin
Node := TreeView1.Items.Add(nil,'My Root Node ' + IntToStr(i));
Node.ImageIndex := 0;
for j := 1 to 3 do
begin
NodeChild := TreeView1.Items.AddChild(Node, 'Child ' + IntToStr(j));
for k := 1 to 2 do
begin
r := Random(20);
sString := Randomstring(r);
TreeView1.Items.AddChild(NodeChild, 'Neto ' + sString);
end;
end;
end;
finally
TreeView1.Items.EndUpdate;
end;
end;
procedure TfrmMain.TreeView1CustomDrawItem_Ballon(Sender: TCustomTreeView; Node: TTreeNode;
State: TCustomDrawState; var DefaultDraw: Boolean);
var
bmp : TBitmap;
txtrect, fullrect : TRect;
nTamanho: Integer;
begin
if Pos('Neto ', Node.text) <= 0 then
Exit;
nTamanho := 13;
txtrect := Node.DisplayRect(True);
fullrect := Node.DisplayRect(False);
txtrect.Right := fullrect.Right;
bmp := TBitmap.Create;
try
bmp.Height := nTamanho;
bmp.Width := nTamanho;
with bmp.Canvas do
begin
Pen.Width := 1;
Pen.Color := clBlue;
Brush.Color := clBlue;
Ellipse(0, 0, nTamanho, nTamanho);
Font.Size := 7;
Font.Color := clWhite;
Font.Style := [fsBold];
TextOut(4, 1, IntToStr(Random(10)));
end;
Sender.Canvas.Draw(txtrect.width, txtrect.Top, bmp);
finally
FreeAndNil(bmp);
end;
end;
procedure TfrmMain.TreeView1CustomDrawItem_Image(Sender: TCustomTreeView; Node: TTreeNode;
State: TCustomDrawState; var DefaultDraw: Boolean);
var
bmp : TBitmap;
txtrect, fullrect : TRect;
nTamanho: Integer;
oPicture: TPicture;
sFilePath: String;
begin
if Pos('Neto ', Node.text) <= 0 then
Exit;
nTamanho := 13;
txtrect := Node.DisplayRect(True);
fullrect := Node.DisplayRect(False);
txtrect.Right := fullrect.Right;
sFilePath := ExtractFilePath(Application.ExeName);
oPicture := TPicture.Create;
bmp := TBitmap.Create;
try
oPicture.LoadFromFile( sFilePath + '\audioevideo.bmp');
bmp.Height := nTamanho;
bmp.Width := nTamanho;
bmp.Canvas.Draw(0, 0, oPicture.Graphic);
Sender.Canvas.Draw(txtrect.width, txtrect.Top, bmp);
finally
FreeAndNil(bmp);
FreeAndNil(oPicture);
end;
end;
procedure TfrmMain.TreeView1CustomDrawItem_Image_Ballon(Sender: TCustomTreeView; Node: TTreeNode;
State: TCustomDrawState; var DefaultDraw: Boolean);
var
bmp : TBitmap;
txtrect, fullrect : TRect;
nTamanho: Integer;
oPicture: TPicture;
sFilePath: String;
begin
if Pos('Neto ', Node.text) <= 0 then
Exit;
nTamanho := 18;
txtrect := Node.DisplayRect(True);
fullrect := Node.DisplayRect(False);
txtrect.Right := fullrect.Right;
sFilePath := ExtractFilePath(Application.ExeName);
oPicture := TPicture.Create;
bmp := TBitmap.Create;
try
bmp.Height := nTamanho;
bmp.Width := nTamanho;
oPicture.LoadFromFile( sFilePath + '\audioevideo.bmp');
with bmp.Canvas do
begin
Draw(0, 0, oPicture.Graphic);
Pen.Width := 1;
Pen.Color := clBlue;
Brush.Color := clBlue;
Ellipse(8, 0, 18, 10);
Font.Size := 7;
Font.Color := clWhite;
TextOut(11, 0, IntToStr(Random(10)));
end;
Sender.Canvas.Draw(txtrect.width, txtrect.Top, bmp);
finally
FreeAndNil(bmp);
FreeAndNil(oPicture);
end;
end;
end.