Title: Listing A System's Drives In A ComboBox, Listbox,...Using Images
Question: This Program Shows How To Put Images In A:
* ComboBox
* ListBox
* TabControl
* ToolBar
I Listed The Systems Drives For This Example
(Removable Disk, Fixed, CD-Rom, Remote & Ramdisk).
Each Of These Disks Has Its Own Picture.
Each Picture Is Stored In An ImageList.
DON''T FORGET TO SET THE STYLE OF THE LISTBOXES, COMBOBOXES,... TO OWNERDRAWN...
The ToolBar Has An ImageList Of Its Own Where The Images Will
Be Put In During The DriveScanning Routine (Same For The TabControl)
For The ListBox & ComboBox, the below mentionned code should be simple to understand...
Answer:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, ImgList, ExtCtrls, ComCtrls, ToolWin;
type
TForm1 = class(TForm)
ComboBox1: TComboBox;
Button1: TButton;
ImageList1: TImageList;
ImageList2: TImageList;
ImageList3: TImageList;
ImageList4: TImageList;
ImageList5: TImageList;
ImageList6: TImageList;
ListBox1: TListBox;
Label1: TLabel;
Label2: TLabel;
Label3: TLabel;
TabControl1: TTabControl;
ToolBar1: TToolBar;
ImageList7: TImageList;
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure ListBox1DrawItem(Control: TWinControl; Index: Integer;
Rect: TRect; State: TOwnerDrawState);
private
{ Private declarations }
procedure MyDraw(Control: TWinControl; Index: Integer; Rect: TRect; State: TOwnerDrawState);
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var Drive : Char;
i,j : integer;
begin
For i:=ToolBar1.ComponentCount -1 downto 0 do
begin
ToolBar1.Components[i].Destroy;
end;
ToolBar1.Visible := False;
i := 0;ImageList1.Clear;
//To Get The Drives Listed From A to Z In A Toolbar
//You Have To Go From 'z' downto 'a' Or The Toolbar
//Will Display The Drives Beginning With The Last One.
For Drive := 'z' downto 'a' do
begin
Case GetDriveType(PChar(Drive + ':\')) of
DRIVE_REMOVABLE :
begin
With TToolButton.Create(Toolbar1) do
begin
Parent := Toolbar1;
Style := tbsButton;
ImageList7.AddImages(ImageList2);
Height := Toolbar1.Height;
ImageIndex := i; Inc(i);
Caption := UpperCase(Drive) + ':\';
end;
end;
DRIVE_FIXED :
begin
With TToolButton.Create(Toolbar1) do
begin
Parent := Toolbar1;
Style := tbsButton;
ImageList7.AddImages(ImageList3);
Height := Toolbar1.Height;
ImageIndex := i; Inc(i);
Caption := UpperCase(Drive) + ':\';
end;
end;
DRIVE_CDROM :
begin
With TToolButton.Create(Toolbar1) do
begin
Parent := Toolbar1;
Style := tbsButton;
ImageList7.AddImages(ImageList4);
Height := Toolbar1.Height;
ImageIndex := i; Inc(i);
Caption := UpperCase(Drive) + ':\';
end;
end;
DRIVE_REMOTE :
begin
With TToolButton.Create(Toolbar1) do
begin
Parent := Toolbar1;
Style := tbsButton;
ImageList7.AddImages(ImageList5);
Height := Toolbar1.Height;
ImageIndex := i; Inc(i);
Caption := UpperCase(Drive) + ':\';
end;
end;
DRIVE_RAMDISK :
begin
With TToolButton.Create(Toolbar1) do
begin
Parent := Toolbar1;
Style := tbsButton;
ImageList7.AddImages(ImageList6);
Height := Toolbar1.Height;
ImageIndex := i; Inc(i);
Caption := UpperCase(Drive) + ':\';
end;
end;
end;
end;
Dec(i);
ToolBar1.Visible := True;
ComboBox1.Clear;ImageList1.Clear;ListBox1.Clear;TabControl1.Tabs.Clear;
For Drive := 'a' to 'z' do
begin
Case GetDriveType(PChar(Drive + ':\')) of
DRIVE_REMOVABLE :
begin
ComboBox1.Items.Add(UpperCase(Drive) + ':\');
ListBox1.Items.Add(UpperCase(Drive) + ':\');
TabControl1.Tabs.Add(UpperCase(Drive) + ':\');
ImageList1.AddImages(ImageList2);
end;
DRIVE_FIXED :
begin
ComboBox1.Items.Add(UpperCase(Drive) + ':\');
ListBox1.Items.Add(UpperCase(Drive) + ':\');
TabControl1.Tabs.Add(UpperCase(Drive) + ':\');
ImageList1.AddImages(ImageList3);
end;
DRIVE_CDROM :
begin
ComboBox1.Items.Add(UpperCase(Drive) + ':\');
ListBox1.Items.Add(UpperCase(Drive) + ':\');
TabControl1.Tabs.Add(UpperCase(Drive) + ':\');
ImageList1.AddImages(ImageList4);
end;
DRIVE_REMOTE :
begin
ComboBox1.Items.Add(UpperCase(Drive) + ':\');
ListBox1.Items.Add(UpperCase(Drive) + ':\');
TabControl1.Tabs.Add(UpperCase(Drive) + ':\');
ImageList1.AddImages(ImageList5);
end;
DRIVE_RAMDISK :
begin
ComboBox1.Items.Add(UpperCase(Drive) + ':\');
ListBox1.Items.Add(UpperCase(Drive) + ':\');
TabControl1.Tabs.Add(UpperCase(Drive) + ':\');
ImageList1.AddImages(ImageList6);
end;
end;
end;
ComboBox1.Itemindex := 0;
ListBox1.Itemindex := 0;
end;
procedure TForm1.MyDraw(Control: TWinControl; Index: Integer; Rect: TRect;
State: TOwnerDrawState);
begin
With (Control As TComboBox).Canvas do
begin
FillRect(Rect);
ImageList1.Draw(Combobox1.Canvas,Rect.Left,Rect.Top + 2,Index,True);
TextOut(Rect.Left + 20,Rect.Top,(Control as TComboBox).Items[Index]);
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
ComboBox1.OnDrawItem := MyDraw;
end;
procedure TForm1.ListBox1DrawItem(Control: TWinControl; Index: Integer;
Rect: TRect; State: TOwnerDrawState);
begin
With (Control As TListbox).Canvas do
begin
FillRect(Rect);
ImageList1.Draw(Listbox1.Canvas,Rect.Left,Rect.Top,Index,True);
TextOut(Rect.Left + 20,Rect.Top + 2,(Control As TListBox).Items[Index]);
end;
end;
end.