unit StatusBarExt;interfaceuses
Windows, Messages, SysUtils, Classes, Controls, ComCtrls;type
TStatusBarExt = class(TStatusBar)
private
{ Private declarations }
protected
{ Protected declarations }
public
{ Public declarations }
constructor Create(AOwner: TComponent);override;
published
{ Published declarations }
end;procedure Register;implementationprocedure Register;
begin
RegisterComponents('rainbowsoft', [TStatusBarExt]);
end;{ TStatusBarExt }constructor TStatusBarExt.Create(AOwner: TComponent);
begin
inherited;
ControlStyle := ControlStyle + [csAcceptsControls];
end;end.
Windows, Messages, SysUtils, Classes, Controls, ComCtrls;type
TStatusBarExt = class(TStatusBar)
private
{ Private declarations }
protected
{ Protected declarations }
public
{ Public declarations }
constructor Create(AOwner: TComponent);override;
published
{ Published declarations }
end;procedure Register;implementationprocedure Register;
begin
RegisterComponents('rainbowsoft', [TStatusBarExt]);
end;{ TStatusBarExt }constructor TStatusBarExt.Create(AOwner: TComponent);
begin
inherited;
ControlStyle := ControlStyle + [csAcceptsControls];
end;end.
begin
ProgressBar1.Parent := StatusBar1;
ProgressBar1.Height := StatusBar1.ClientHeight - 3;
ProgressBar1.Top := 3;
ProgressBar1.Left := 1;
end;
I:integer;
begin
ProgressBar1.MAX:=adodataset.recordcount;
ProgressBar1.Min:=0;
i:=0;
while not adodataset.eof do
begin
i:=i+1;
ProgressBar1.position:=i;
adodataset.next;
end;
ProgressBar1.position :=0;
end;
编译时怎么出这个错误啊?
第二步,在FROM的Private中申明一个TProgressBar类型的变量Progress。然后在一个菜单的消息响应过程中调用Create方法把它建立起来,再设定状态条为该进程条的父窗口,进而设定进程条的一些必要参数。例如:最大值、最小值、原点坐标、高度和宽度等。
最后编译一下该程序,你就会发现在状态条中被插入了一个运动着的进程条。
类似地,你还可以在状态条中插入其他可视控件,如:按键、位图和动画控件等等。
以下是范例程序:
type
TForm1 = class(TForm)//定义一个窗口类
Status: TStatusBar;
MainMenu1: TMainMenu;
file1: TMenuItem;
insertprocressbar1: TMenuItem;
N1: TMenuItem;
exit1: TMenuItem;
procedure FormCreate(Sender: TObject);
procedure StatusDrawPanel(StatusBar: TStatusBar; Panel:
TStatusPanel;const Rect: TRect);
procedure FormDestroy(Sender: TObject);
procedure exit1Click(Sender: TObject);
procedure insertprocressbar1Click(Sender: TObject);
private
colorindex : integer; BookOpen:Boolean;
ssbmp:Tbitmap; progress:TProgressbar;
StatusDrawRect:TRect; //记录要插入状态条特技的坐标范围
public
{ Public declarations }
end; var
Form1: TForm1; implementation {$R *.DFM} procedure TForm1.FormCreate(Sender: TObject);
begin
end; procedure TForm1.StatusDrawPanel(StatusBar: TStatusBar;
Panel: TStatusPanel; const Rect: TRect);
begin
StatusDrawRect:=rect; //记录要实现状态条特技的坐标范围
end;procedure TForm1.exit1Click(Sender: TObject);
begin
close;
end; procedure TForm1.insertprocressbar1Click(Sender: TObject);
var i,count:integer;
staPanleWidth:integer;
begin
progress:=TProgressbar.create(form1);
count:=3000; //进程条的最大值
staPanleWidth:=status.Panels.Items[2].width;
//由于进程条的很宽,所以需要改变状态条嵌板的宽度,这里先保存它的宽度。
status.Panels.Items[2].width:=150; // 改变宽度
status.repaint;
with progress do
begin
top:=StatusDrawRect.top;
left:=StatusDrawRect.left;
width:=StatusDrawRect.right-StatusDrawRect.left;
height:=StatusDrawRect.bottom-StatusDrawRect.top;
//设定进程条的宽度和高度
visible:=true;
try
Parent := status; //该进程条的拥有者为状态条status
Min := 0; Max := Count; //进程条的最大和最小值
Step := 1; //进程条的步长
for i := 1 to Count do
Stepit; // 累加进程条
ShowMessage('现在,进程条将要从内存中被释放');
finally
Free; //释放进程条
end; //try
end; //with
status.Panels.Items[2].width:=staPanleWidth; //恢复状态条嵌板的宽度
end; //begin end.
ProgBar: TProgressBar;
PanelRect: TRect;procedure TfMain.StatusBar1DrawPanel(StatusBar: TStatusBar;
Panel: TStatusPanel; const Rect: TRect);
begin
if Panel.Index = 1 then PanelRect := Rect;
end;procedure TForm1.FormCreate(Sender: TObject);
begin
ProgBar := TProgressBar.Create(Form1);
ProgBar.Parent := StatusBar1;
ProgBar.SetBounds(PanelRect.Left, PanelRect.Top, PanelRect.Right - PanelRect.Left, PanelRect.Bottom - PanelRect.Top);
ProgBar.Visible := true;
StatusBar1.Repaint;
end;procedure TForm1.FormCreate(Sender: TObject);
begin
if Assigned(ProgBar) then ProgBar.Free;
end;
应当是
procedure TForm1.StatusBar1DrawPanel(StatusBar: TStatusBar;这段代码是用来在状态条中显示TProgressBar的,
它动态创建一个TProgressBar,并将它的Parent设置为StatusBar。
如果需要显示数字,应该可以将TProgressBar换成TGauge,但是我没有试过。