unitcenterfeature.~pas

在delphi下基于MapX5.0的GIS程序

unit UnitCenterFeature;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Buttons, ExtCtrls;

type
  TFrmCenterFeature = class(TForm)
    CBoxName: TComboBox;
    BBtnOK: TBitBtn;
    BBtnCancel: TBitBtn;
    TimerInfo: TTimer;
    procedure FormShow(Sender: TObject);
    procedure TimerInfoTimer(Sender: TObject);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
    procedure BBtnOKClick(Sender: TObject);
    procedure BBtnCancelClick(Sender: TObject);
  private
    procedure WMNCPaint(var Msg: TWMNCPaint); message WM_NCPAINT; 
    { Private declarations }
  public
    { Public declarations }
  end;

var
  FrmCenterFeature: TFrmCenterFeature;
  OnShowing: Boolean;

implementation

uses UnitDataModule, UnitSearch, UnitCommonModule;

{$R *.dfm}

// 画窗体边框
procedure TFrmCenterFeature.WMNCPaint(var Msg: TWMNCPaint);
var
  dc : hDc;
  Pen : hPen;
  OldPen : hPen;
  OldBrush : hBrush;
begin
  inherited;
  dc := GetWindowDC(Handle);
  msg.Result := 1;
  Pen := CreatePen(PS_SOLID, 2, RGB(255, 0, 0));
  OldPen := SelectObject(dc, Pen);
  OldBrush := SelectObject(dc, GetStockObject(NULL_BRUSH));
  if OnShowing and TimerInfo.Enabled then Windows.Rectangle(dc, 0, 0, Width, Height+5);
  if Not TimerInfo.Enabled then Windows.Rectangle(dc, 0, 0, Width, Height);
  if Not OnShowing and TimerInfo.Enabled then Windows.Rectangle(dc, 0, 0, Width, Height-5);
  SelectObject(dc, OldBrush);
  SelectObject(dc, OldPen);
  DeleteObject(Pen);
  ReleaseDC(Handle, Canvas.Handle);
end;

procedure TFrmCenterFeature.FormShow(Sender: TObject);
begin
  TimerInfo.Enabled := True;
  OnShowing := True;
  CBoxName.Clear;
  DM.ADOQueryCenterFind.First;
  while Not DM.ADOQueryCenterFind.Eof do
  begin
    CBoxName.Items.Add(DM.ADOQueryCenterFind.FieldByName('Name').AsString);
    DM.ADOQueryCenterFind.Next;
  end;
  CBoxName.ItemIndex := 0;
end;

procedure TFrmCenterFeature.TimerInfoTimer(Sender: TObject);
begin
  if OnShowing then
  begin
    Height := Height + 5;
    if Height > 100 then TimerInfo.Enabled := False;
  end
  else
  begin
    Height := Height - 5;
    if Height < 30 then
    begin
      TimerInfo.Enabled := False;
      Close;
    end;
  end;
end;

procedure TFrmCenterFeature.FormCloseQuery(Sender: TObject;
  var CanClose: Boolean);
begin
  if Height > 30 then
  begin
    CanClose := False;
    OnShowing := False;
    TimerInfo.Enabled := True;
  end;
end;

procedure TFrmCenterFeature.BBtnOKClick(Sender: TObject);
var
  Distance: Integer;
begin
  Distance := (FrmSearch.CBoxNearInfDistance.ItemIndex + 1)* 10;
  CenterFeatureFind(CBoxName.Text, Distance, FrmSearch.CBoxNearInfType.Text);
end;

procedure TFrmCenterFeature.BBtnCancelClick(Sender: TObject);
begin
  Close;
end;

end.