自画TlistView带进度条的Item
TListView的Item条一般是由系统自画的，但电驴就实现了自画，使之看起来很漂亮，我们用DELPHI也可以实现！
首先要引用CommCtrl单元，这是TListView底层控制单元：
uses
CommCtrl;
//画状态条
procedure DrawSubItem(LV: TListView; Item: TListItem; SubItem: Integer;
Prosition: Single; Max, Style: Integer; IsShowProgress: Boolean;
DrawColor: TColor = $ 00005B00;
FrameColor: TColor = $ 00002F00);
//获取SubItem的区域
function GetItemRect(LV_Handle, iItem, iSubItem: Integer): TRect;
var
Rect: TRect;
begin
ListView_GetSubItemRect(LV_Handle, iItem, iSubItem, LVIR_LABEL, @Rect);
Result := Rect;
end;
var
PaintRect, r: TRect;
i, iWidth, x, y: integer;
S: string;
begin
try
with lv do
begin
//LockPaint := True;
PaintRect := GetItemRect(LV.Handle, Item.Index, SubItem);
r := PaintRect;
// if SubItem = DrawSubItem then
Begin
//这一段是算出百分比
if Prosition >= Max then
Prosition := 100
else
if Prosition <= 0 then
Prosition := 0
else
Prosition := Round((Prosition / Max) * 100);
if (Prosition = 0) and (not IsShowProgress) then
begin
//如果是百分比是0，就直接显示空白
Canvas.FillRect(r);
end
else
begin
//先直充背景色
Canvas.FillRect(r);
Canvas.Brush.Color := Color;
// Canvas.FillRect(r);
//画一个外框
InflateRect(r, -2, -2);
Canvas.Brush.Color := FrameColor; //$ 00002F00;
Canvas.FrameRect(R);
Canvas.Brush.Color := Color;
InflateRect(r, -1, -1);
// Canvas.FillRect(r);
InflateRect(r, -1, -1);
//根据百分比算出要画的进度条内容宽度
iWidth := R.Right - Round((R.Right - r.Left) * ((100 - Prosition) /
100));
case Style of
0: //进度条类型，实心填充
begin
Canvas.Brush.Color := DrawColor;
r.Right := iWidth;
Canvas.FillRect(r);
end;
1: //进度条类型，竖线填充
begin
i := r.Left;
while i < iWidth do
begin
Canvas.Pen.Color := Color;
Canvas.MoveTo(i, r.Top);
Canvas.Pen.Color := DrawColor;
canvas.LineTo(i, r.Bottom);
Inc(i, 3);
end;
end;
end;
//画好了进度条后，现在要做的就是显示进度数字了
Canvas.Brush.Style := bsClear;
if Prosition = Round(Prosition) then
S := Format('%d%%', [Round(Prosition)])
else
S := FormatFloat('#0.0', Prosition);
with PaintRect do
begin
x := Left + (Right - Left + 1 - Canvas.TextWidth(S)) div 2;
y := Top + (Bottom - Top + 1 - Canvas.TextHeight(S)) div 2;
end;
SetBkMode(Canvas.handle, TRANSPARENT);
Canvas.TextRect(PaintRect, x, y, S);
end;
//进度条全部画完，把颜色设置成默认色了
Canvas.Brush.Color := Color;
end
end;
except
end;
end;
上面是画进度条的，现在要给TlistView处理Item重绘的消息，事件是OnCustomDrawItem，需要说明的是，如果想要随心所欲的自画Item，那么就要全部自己来完成，不再需要系统来处理：
procedure TForm1.ListView1CustomDrawItem(
Sender: TCustomListView; Item: TListItem; State: TCustomDrawState;
var DefaultDraw: Boolean);
var
BoundRect, Rect: TRect;
i: integer;
TextFormat: Word;
LV: TListView;
//这个子过程是用来画CheckBox和ImageList的
procedure Draw_CheckBox_ImageList(r: TRect; aCanvas: TCanvas; Checked: Boolean);
var
R1: TRect;
i: integer;
begin
if Sender.Checkboxes then
begin
aCanvas.Pen.Color := clBlack;
aCanvas.Pen.Width := 2;
//画CheckBox外框
aCanvas.Rectangle(r.Left + 2, r.Top + 2, r.Left + 14, r.Bottom - 2);
if Checked then
begin //画CheckBox的勾
aCanvas.MoveTo(r.Left + 4, r.Top + 6);
aCanvas.LineTo(r.Left + 6, r.Top + 11);
aCanvas.LineTo(r.Left + 11, r.Top + 5);
end;
aCanvas.Pen.Width := 1;
end;
//开始画图标
i := PDownLoadListItem(Item.Data)^.StatsImageIndex;
if i > -1 then
begin
//获取图标的RECT
if Boolean(ListView_GetSubItemRect(sender.Handle, item.Index, 0, LVIR_ICON, @R1)) then
begin
ImageList_Stats.Draw(LV.Canvas, R1.Left, R1.Top, i);
if item.ImageIndex > -1 then
LV.SmallImages.Draw(LV.Canvas, R1.Right + 2, R1.Top, item.ImageIndex);
end;
end;
end;
begin
LV := ListView1;
BoundRect := Item.DisplayRect(drBounds);
InflateRect(BoundRect, -1, 0);
//这个地方你可以根据自己的要求设置成想要的颜色，实现突出显示
LV.Canvas.Font.Color := clBtnText;
//查看是否是被选中
if Item.Selected then
begin
if cdsFocused in State then
begin
LV.Canvas.Brush.Color := $ 00ECCCB9; // //clHighlight;
end
else
begin
LV.Canvas.Brush.Color := $ 00F8ECE5; //clSilver;
end;
end
else
begin
if (Item.Index mod 2) = 0 then
LV.Canvas.Brush.Color := clWhite
else
LV.Canvas.Brush.Color := $ 00F2F2F2;
end;
LV.Canvas.FillRect(BoundRect); //初始化背景
for i := 0 to LV.Columns.Count - 1 do
begin
//获取SubItem的Rect
ListView_GetSubItemRect(LV.Handle, Item.Index, i, LVIR_LABEL, @Rect);
case LV.Columns[i].Alignment of
taLeftJustify:
TextFormat := 0;
taRightJustify:
TextFormat := DT_RIGHT;
taCenter:
TextFormat := DT_CENTER;
end;
case i of
0: //画Caption，0就是表示Caption，这不是Subitems[0]
begin
//先画选择框与图标
Draw_CheckBox_ImageList(BoundRect, LV.Canvas, Item.Checked);
//再画Caption的文字
InflateRect(Rect, -(5 + ImageList_Stats.Width), 0); //向后移3个像素,避免被后面画线框时覆盖
DrawText(
LV.Canvas.Handle,
PCHAR(Item.Caption),
Length(Item.Caption),
Rect,
DT_VCENTER or DT_SINGLELINE or DT_END_ELLIPSIS or TextFormat);
end;
1..MaxInt: //画Subitems[i]
begin
if i - 1 = 2 then //显示状态条
begin
//开始处理进度条了，这个示例是第3栏显示进度条，可以自己随便定义
DrawSubItem(TListView(Sender),
item,
i,
StrToFloatDef(Item.SubItems[i - 1], 0),
100,
0,
True,
//这里用了一个Lable来选颜色，你自己可以使用一个变量来代替
LableProgressColor.Color, //进度条外框颜色
LableProgressColor.Color //进度条颜色
);
end
else
//画SubItem的文字
if i - 1 <= Item.SubItems.Count - 1 then
DrawText(
LV.Canvas.Handle,
PCHAR(Item.SubItems[i - 1]),
Length(Item.SubItems[i - 1]),
Rect,
DT_VCENTER or DT_SINGLELINE or DT_END_ELLIPSIS or TextFormat);
end;
end;
end;
LV.Canvas.Brush.Color := clWhite;
if Item.Selected then //画选中条外框
begin
if cdsFocused in State then//控件是否处于激活状态
LV.Canvas.Brush.Color := $ 00DAA07A // $ 00E2B598; //clHighlight;
else
LV.Canvas.Brush.Color := $ 00E2B598; //$ 00DAA07A // clHighlight;
LV.Canvas.FrameRect(BoundRect); //
end;
DefaultDraw := False; //不让系统画了
with Sender.Canvas do
if Assigned(Font.OnChange) then Font.OnChange(Font);
end;
function ReDrawItem(HwndLV: HWND; ItemIndex: integer): boolean;
begin
Result := ListView_RedrawItems(HwndLV, ItemIndex, ItemIndex);
end;
//使用：
item:=ListView1.Selected;
item.subitems[1]:=30;//设置为30%
//然后刷新这个item
ReDrawItem(ListView1.handle,Item.index);
不用进度条时的效果图：
