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|
{
fpGUI - Free Pascal GUI Toolkit
Copyright (C) 2006 - 2012 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Description:
Defines a Base Grid control. Usable as the base for any grid type of
component.
}
unit fpg_basegrid;
{$mode objfpc}{$H+}
{.$Define DEBUG}
interface
uses
Classes,
SysUtils,
fpg_base,
fpg_main,
fpg_widget,
fpg_scrollbar,
fpg_menu;
type
TfpgGridDrawState = set of (gdSelected, gdFocused, gdFixed);
TfpgGridHeaderStyle = (ghsButton, ghsThin, ghsFlat);
TfpgFocusChangeNotify = procedure(Sender: TObject; ARow, ACol: Integer) of object;
TfpgRowChangeNotify = procedure(Sender: TObject; ARow: Integer) of object;
TfpgCanSelectCellEvent = procedure(Sender: TObject; const ARow, ACol: Integer; var ACanSelect: boolean) of object;
TfpgDrawCellEvent = procedure(Sender: TObject; const ARow, ACol: Integer; const ARect: TfpgRect; const AFlags: TfpgGridDrawState; var ADefaultDrawing: boolean) of object;
// widget options
TfpgGridOption = (go_HideFocusRect, go_AlternativeColor, go_SmoothScroll);
TfpgGridOptions = set of TfpgGridOption;
// Column 2 is special just for testing purposes. Descendant classes will
// override that special behavior anyway.
{ TfpgBaseGrid }
TfpgBaseGrid = class(TfpgWidget)
private
FColResizing: boolean;
FDragPos: integer; // used for column resizing
FHeaderStyle: TfpgGridHeaderStyle;
FOnDrawCell: TfpgDrawCellEvent;
FResizedCol: integer; // used for column resizing
FDefaultColWidth: integer;
FDefaultRowHeight: integer;
FFocusCol: Integer;
FFocusRow: Integer;
FHeaderHeight: integer;
FOnCanSelectCell: TfpgCanSelectCellEvent;
FOnFocusChange: TfpgFocusChangeNotify;
FOnRowChange: TfpgRowChangeNotify;
FPrevCol: Integer;
FPrevRow: Integer;
FFirstRow: Integer;
FFirstCol: Integer;
FXOffset: integer; // used for go_SmoothScroll
FMargin: integer;
FFont: TfpgFont;
FHeaderFont: TfpgFont;
FRowSelect: boolean;
FScrollBarStyle: TfpgScrollStyle;
FShowGrid: boolean;
FShowHeader: boolean;
FTemp: integer;
FVScrollBar: TfpgScrollBar;
FHScrollBar: TfpgScrollBar;
FUpdateCount: integer;
FOptions: TfpgGridOptions;
FPopupMenu: TfpgPopupMenu;
FAlternativeBGColor: TfpgColor;
FBorderStyle: TfpgEditBorderStyle;
function GetFontDesc: string;
function GetHeaderFontDesc: string;
function GetTotalColumnWidth: integer;
procedure HScrollBarMove(Sender: TObject; position: integer);
procedure SetFontDesc(const AValue: string);
procedure SetHeaderFontDesc(const AValue: string);
procedure SetHeaderStyle(const AValue: TfpgGridHeaderStyle);
procedure SetRowSelect(const AValue: boolean);
procedure SetScrollBarStyle(const AValue: TfpgScrollStyle);
procedure VScrollBarMove(Sender: TObject; position: integer);
procedure SetDefaultColWidth(const AValue: integer);
procedure SetDefaultRowHeight(const AValue: integer);
procedure SetFocusCol(const AValue: Integer);
procedure SetFocusRow(const AValue: Integer);
procedure CheckFocusChange;
procedure SetShowGrid(const AValue: boolean);
procedure SetShowHeader(const AValue: boolean);
function VisibleLines: Integer;
function VisibleWidth: integer;
function VisibleHeight: integer;
procedure SetFirstRow(const AValue: Integer);
procedure SetAlternativeBGColor(const AValue: TfpgColor);
procedure SetBorderStyle(AValue: TfpgEditBorderStyle);
protected
property UpdateCount: integer read FUpdateCount;
procedure UpdateScrollBars; virtual;
function GetHeaderText(ACol: Integer): string; virtual;
function GetColumnWidth(ACol: Integer): integer; virtual;
procedure SetColumnWidth(ACol: Integer; const AValue: integer); virtual;
function GetBackgroundColor(ARow: integer; ACol: integer): TfpgColor; virtual;
function GetColumnBackgroundColor(ACol: Integer): TfpgColor; virtual;
procedure SetColumnBackgroundColor(ACol: Integer; const AValue: TfpgColor); virtual;
function GetColumnTextColor(ACol: Integer): TfpgColor; virtual;
procedure SetColumnTextColor(ACol: Integer; const AValue: TfpgColor); virtual;
function GetColumnCount: Integer; virtual;
function GetRowCount: Integer; virtual;
function CanSelectCell(const ARow, ACol: Integer): boolean;
function DoDrawCellEvent(ARow, ACol: Integer; ARect: TfpgRect; AFlags: TfpgGridDrawState): boolean; virtual;
procedure DoCanSelectCell(const ARow, ACol: Integer; var ACanSelect: boolean);
procedure DrawCell(ARow, ACol: Integer; ARect: TfpgRect; AFlags: TfpgGridDrawState); virtual;
procedure DrawHeader(ACol: Integer; ARect: TfpgRect; AFlags: integer); virtual;
procedure DrawGrid(ARow, ACol: Integer; ARect: TfpgRect; AFlags: integer); virtual;
procedure HandlePaint; override;
procedure HandleShow; override;
procedure HandleResize(awidth, aheight: TfpgCoord); override;
procedure HandleKeyPress(var keycode: word; var shiftstate: TShiftState; var consumed: boolean); override;
procedure HandleMouseScroll(x, y: integer; shiftstate: TShiftState; delta: smallint); override;
procedure HandleMouseHorizScroll(x, y: integer; shiftstate: TShiftState; delta: smallint); override;
procedure HandleMouseMove(x, y: integer; btnstate: word; shiftstate: TShiftState); override;
procedure HandleLMouseUp(x, y: integer; shiftstate: TShiftState); override;
procedure HandleLMouseDown(x, y: integer; shiftstate: TShiftState); override;
procedure HandleRMouseUp(x, y: integer; shiftstate: TShiftState); override;
procedure FollowFocus; virtual;
procedure PrepareCells (firstrow, lastrow, firstcol, lastcol : integer); virtual;
property AlternateBGColor: TfpgColor read FAlternativeBGColor write SetAlternativeBGColor default clHilite1;
property BorderStyle: TfpgEditBorderStyle read FBorderStyle write SetBorderStyle default ebsDefault;
property DefaultColWidth: integer read FDefaultColWidth write SetDefaultColWidth default 64;
property DefaultRowHeight: integer read FDefaultRowHeight write SetDefaultRowHeight;
property Font: TfpgFont read FFont;
property FontDesc: string read GetFontDesc write SetFontDesc;
property HeaderFont: TfpgFont read FHeaderFont;
property HeaderFontDesc: string read GetHeaderFontDesc write SetHeaderFontDesc;
property FocusCol: Integer read FFocusCol write SetFocusCol default -1;
property FocusRow: Integer read FFocusRow write SetFocusRow default -1;
property HeaderStyle: TfpgGridHeaderStyle read FHeaderStyle write SetHeaderStyle default ghsButton;
property RowSelect: boolean read FRowSelect write SetRowSelect;
property ColumnCount: Integer read GetColumnCount;
property PopupMenu: TfpgPopupMenu read FPopupMenu write FPopupMenu;
property RowCount: Integer read GetRowCount;
property ShowHeader: boolean read FShowHeader write SetShowHeader default True;
property ShowGrid: boolean read FShowGrid write SetShowGrid default True;
property ScrollBarStyle: TfpgScrollStyle read FScrollBarStyle write SetScrollBarStyle default ssAutoBoth;
property HeaderHeight: integer read FHeaderHeight;
property TotalColumnWidth: integer read GetTotalColumnWidth;
// property ColResizing: boolean read FColResizing write FColResizing;
property ColumnWidth[ACol: Integer]: integer read GetColumnWidth write SetColumnWidth;
property ColumnBackgroundColor[ACol: Integer]: TfpgColor read GetColumnBackgroundColor write SetColumnBackgroundColor;
property ColumnTextColor[ACol: Integer]: TfpgColor read GetColumnTextColor write SetColumnTextColor;
property VisibleRows: Integer read VisibleLines;
property TopRow: Integer read FFirstRow write SetFirstRow;
property Options: TfpgGridOptions read FOptions write FOptions default [];
property OnDrawCell: TfpgDrawCellEvent read FOnDrawCell write FOnDrawCell;
property OnFocusChange: TfpgFocusChangeNotify read FOnFocusChange write FOnFocusChange;
property OnRowChange: TfpgRowChangeNotify read FOnRowChange write FOnRowChange;
property OnCanSelectCell: TfpgCanSelectCellEvent read FOnCanSelectCell write FOnCanSelectCell;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure AfterConstruction; override;
procedure Update;
procedure BeginUpdate;
procedure EndUpdate;
procedure MouseToCell(X, Y: Integer; var ACol, ARow: Integer);
end;
implementation
{ TfpgBaseGrid }
procedure TfpgBaseGrid.HScrollBarMove(Sender: TObject; position: integer);
begin
if go_SmoothScroll in FOptions then
begin
if FXOffset <> position then
begin
if Position < 0 then
Position := 0;
FXOffset := position;
Repaint;
end;
end
else
begin
if FFirstCol <> position then
begin
if Position < 0 then
Position := 0;
FFirstCol := position;
RePaint;
end;
end;
end;
function TfpgBaseGrid.GetFontDesc: string;
begin
Result := FFont.FontDesc;
end;
function TfpgBaseGrid.GetHeaderFontDesc: string;
begin
Result := FHeaderFont.FontDesc;
end;
function TfpgBaseGrid.GetTotalColumnWidth: integer;
var
i: integer;
begin
Result := 0;
for i := 0 to ColumnCount-1 do
Result := Result + ColumnWidth[i];
end;
procedure TfpgBaseGrid.SetFontDesc(const AValue: string);
begin
FFont.Free;
FFont := fpgGetFont(AValue);
if DefaultRowHeight < FFont.Height + 2 then
DefaultRowHeight := FFont.Height + 2;
RePaint;
end;
procedure TfpgBaseGrid.SetHeaderFontDesc(const AValue: string);
begin
FHeaderFont.Free;
FHeaderFont := fpgGetFont(AValue);
if FHeaderHeight < FHeaderFont.Height + 2 then
FHeaderHeight := FHeaderFont.Height + 2;
RePaint;
end;
procedure TfpgBaseGrid.SetHeaderStyle(const AValue: TfpgGridHeaderStyle);
begin
if FHeaderStyle = AValue then
exit;
FHeaderStyle := AValue;
Repaint;
end;
procedure TfpgBaseGrid.SetRowSelect(const AValue: boolean);
begin
if FRowSelect = AValue then
Exit; //==>
FRowSelect := AValue;
RePaint;
end;
procedure TfpgBaseGrid.SetScrollBarStyle(const AValue: TfpgScrollStyle);
begin
if FScrollBarStyle = AValue then
Exit; //==>
FScrollBarStyle := AValue;
end;
procedure TfpgBaseGrid.VScrollBarMove(Sender: TObject; position: integer);
begin
if FFirstRow <> position then
begin
FFirstRow := position;
RePaint;
end;
end;
procedure TfpgBaseGrid.SetDefaultColWidth(const AValue: integer);
begin
if FDefaultColWidth = AValue then
Exit; //==>
FDefaultColWidth := AValue;
RePaint;
end;
procedure TfpgBaseGrid.SetDefaultRowHeight(const AValue: integer);
begin
if FDefaultRowHeight = AValue then
Exit; //==>
FDefaultRowHeight := AValue;
RePaint;
end;
function TfpgBaseGrid.GetColumnWidth(ACol: Integer): integer;
begin
Result := 50;
end;
procedure TfpgBaseGrid.SetColumnWidth(ACol: Integer; const AValue: integer);
begin
// GetColumnWidth and SetColumnWidth will be overriden in decendant!
// Column 2 is special just for testing purposes
if (ACol = 2) and (AValue <> FTemp) then
begin
FTemp := AValue;
UpdateScrollBars;
Repaint;
end;
end;
function TfpgBaseGrid.GetBackgroundColor(ARow: integer; ACol: integer): TfpgColor;
begin
if (ARow >= 0) and (ACol >= 0) and (ARow < RowCount) and (ACol < ColumnCount) then
begin
if go_AlternativeColor in Options then
begin
if (ARow mod 2) <> 0 then
Result := AlternateBGColor
else
Result := ColumnBackgroundColor[ACol];
end
else
Result := ColumnBackgroundColor[ACol];
end
else
Result := BackgroundColor;
end;
function TfpgBaseGrid.GetColumnBackgroundColor(ACol: Integer): TfpgColor;
begin
// implemented in descendant
end;
procedure TfpgBaseGrid.SetColumnBackgroundColor(ACol: Integer; const AValue: TfpgColor);
begin
// implemented in descendant
end;
function TfpgBaseGrid.GetColumnTextColor(ACol: Integer): TfpgColor;
begin
// implemented in descendant
end;
procedure TfpgBaseGrid.SetColumnTextColor(ACol: Integer; const AValue: TfpgColor);
begin
// implemented in descendant
end;
function TfpgBaseGrid.GetColumnCount: Integer;
begin
Result := 7;
end;
function TfpgBaseGrid.GetRowCount: Integer;
begin
Result := 24;
end;
function TfpgBaseGrid.CanSelectCell(const ARow, ACol: Integer): boolean;
begin
Result := (ARow >= 0) and (ACol >= 0) and (ARow < RowCount) and (ACol < ColumnCount);
if Result then
DoCanSelectCell(ARow, ACol, Result);
end;
function TfpgBaseGrid.DoDrawCellEvent(ARow, ACol: Integer; ARect: TfpgRect;
AFlags: TfpgGridDrawState): boolean;
begin
Result := True;
if Assigned(OnDrawCell) then
FOnDrawCell(self, ARow, ACol, ARect, AFlags, Result);
end;
procedure TfpgBaseGrid.DoCanSelectCell(const ARow, ACol: Integer; var
ACanSelect: boolean);
begin
if Assigned(OnCanSelectCell) then
FOnCanSelectCell(self, ARow, ACol, ACanSelect);
end;
procedure TfpgBaseGrid.DrawCell(ARow, ACol: Integer; ARect: TfpgRect; AFlags: TfpgGridDrawState);
var
s: string;
begin
s := 'c(' + IntToStr(ARow) + ',' + IntToStr(ACol) + ')';
if (ARow = 5) and (ACol = 2) then
s := 'Here lives Graeme!';
if not Enabled then
Canvas.SetTextColor(clShadow1);
Canvas.DrawText(ARect, s, [txtHCenter, txtVCenter]);
end;
procedure TfpgBaseGrid.DrawHeader(ACol: Integer; ARect: TfpgRect; AFlags: integer);
var
s: string;
r: TfpgRect;
x: integer;
begin
r := ARect;
// Here we can implement a head style check
case FHeaderStyle of
ghsButton:
begin
Canvas.DrawButtonFace(ARect, [btfIsEmbedded]);
InflateRect(r, -2, -2);
end;
ghsThin:
begin
Canvas.DrawBevel(ARect);
end;
ghsFlat:
begin
Canvas.Color:= clGridHeader;
Canvas.FillRectangle(r);
Canvas.Color:= clShadow2;
Canvas.DrawLine(r.Left, r.Bottom, r.Right, r.Bottom); { bottom line }
Canvas.DrawLine(r.Right, r.Bottom, r.Right, r.Top-1); { right line }
end;
end;
Canvas.AddClipRect(r); // text may not overshoot header border
(*
// drawing grid lines
Canvas.SetColor(clGridLines);
Canvas.DrawLine(r.Left, r.Bottom+1, r.Right+1, r.Bottom+1); // horizontal bottom
Canvas.DrawLine(r.Right+1, r.Top, r.Right+1, r.Bottom+1); // vertical right
if (ACol mod 2) = 0 then
Canvas.SetColor(clGridHeader)
else
Canvas.SetColor(clMagenta);
Canvas.FillRectangle(ARect);
*)
Canvas.SetTextColor(clText1);
s := GetHeaderText(ACol);
x := (ARect.Left + (ARect.Width div 2)) - (FHeaderFont.TextWidth(s) div 2);
if not (go_SmoothScroll in FOptions) then
begin
if x < 1 then
x := 1;
end;
fpgStyle.DrawString(Canvas, x, ARect.Top+1, s, Enabled);
end;
procedure TfpgBaseGrid.DrawGrid(ARow, ACol: Integer; ARect: TfpgRect;
AFlags: integer);
begin
// default is inside bottom/right edge or cell
Canvas.SetColor(clGridLines);
if (BorderStyle <> ebsDefault) and (ACol = 0) then
Canvas.DrawLine(ARect.Left, ARect.Top, ARect.Left, ARect.Bottom); // cell left of first column only
Canvas.DrawLine(ARect.Left, ARect.Bottom, ARect.Right, ARect.Bottom); // cell bottom
Canvas.DrawLine(ARect.Right, ARect.Bottom, ARect.Right, ARect.Top-1); // cell right
end;
procedure TfpgBaseGrid.SetFocusCol(const AValue: Integer);
begin
if FFocusCol = AValue then
Exit; //==>
FFocusCol := AValue;
// apply min/max limit
if FFocusCol < 0 then
FFocusCol := 0;
if FFocusCol > ColumnCount-1 then
FFocusCol := ColumnCount-1;
FollowFocus;
Update;
end;
procedure TfpgBaseGrid.SetFocusRow(const AValue: Integer);
begin
if FFocusRow = AValue then
Exit; //==>
FFocusRow := AValue;
// apply min/max limit
if FFocusRow < 0 then
FFocusRow := 0;
if FFocusRow > RowCount-1 then
FFocusRow := RowCount-1;
FollowFocus;
Update;
end;
procedure TfpgBaseGrid.CheckFocusChange;
begin
if ((FPrevCol <> FFocusCol) and not RowSelect) or (FPrevRow <> FFocusRow) then
if Assigned(FOnFocusChange) then
FOnFocusChange(self, FFocusRow, FFocusCol);
if (FPrevRow <> FFocusRow) then
if Assigned(FOnRowChange) then
FOnRowChange(self, FFocusRow);
FPrevCol := FFocusCol;
FPrevRow := FFocusRow;
end;
procedure TfpgBaseGrid.SetShowGrid(const AValue: boolean);
begin
if FShowGrid = AValue then
Exit; //==>
FShowGrid := AValue;
RePaint;
end;
procedure TfpgBaseGrid.SetShowHeader(const AValue: boolean);
begin
if FShowHeader = AValue then
Exit; //==>
FShowHeader := AValue;
UpdateScrollBars;
RePaint;
end;
// Return the fully visible lines only. Partial lines not counted
function TfpgBaseGrid.VisibleLines: Integer;
var
hh: integer;
begin
if FHScrollBar.Visible then
hh := FHScrollbar.Height
else
hh := 0;
if ShowHeader then
hh := hh + FHeaderHeight+1;
Result := (Height - (2*FMargin) - hh) div FDefaultRowHeight;
end;
function TfpgBaseGrid.VisibleWidth: integer;
var
sw: integer;
begin
if FVScrollBar.Visible then
sw := FVScrollBar.Width-1
else
sw := 0;
Result := Width - (FMargin*2) - sw;
end;
function TfpgBaseGrid.VisibleHeight: integer;
var
sw: integer;
begin
if FHScrollBar.Visible then
sw := FHScrollBar.Height-1
else
sw := 0;
Result := Height - (FMargin*2) - sw;
end;
procedure TfpgBaseGrid.SetFirstRow(const AValue: Integer);
begin
if FFirstRow = AValue then
Exit; //==>
if AValue < ((RowCount - VisibleLines)) then
FFirstRow := AValue
else
FFirstRow := (RowCount - VisibleLines);
UpdateScrollBars;
RePaint;
end;
procedure TfpgBaseGrid.SetAlternativeBGColor(const AValue: TfpgColor);
begin
if FAlternativeBGColor = AValue then exit;
FAlternativeBGColor := AValue;
end;
procedure TfpgBaseGrid.SetBorderStyle(AValue: TfpgEditBorderStyle);
begin
if FBorderStyle = AValue then
Exit;
FBorderStyle := AValue;
Repaint;
end;
procedure TfpgBaseGrid.UpdateScrollBars;
var
HWidth: integer;
VHeight: integer;
vw: integer;
cw: integer;
vl: integer;
i: integer;
x: integer;
Hfits, showH : boolean;
Vfits, showV : boolean;
procedure hideScrollbar (sb : TfpgScrollBar);
begin
with sb do
if Visible then
begin
Visible := False;
UpdateWindowPosition;
end;
end;
procedure getVisWidth;
begin
if showV then
vw := HWidth - (FVScrollBar.Width-1)
else
vw := HWidth;
Hfits := vw >= cw;
end;
procedure getVisLines;
var
hh : integer; // header height
begin
hh := 0;
if ShowHeader then inc (hh, FHeaderHeight+1);
if showH then inc (hh, FHScrollBar.Height);
vl := (VHeight - hh) div FDefaultRowHeight;
Vfits := vl >= RowCount;
end;
begin
// if we don't want any scrollbars, hide them and exit
if FScrollBarStyle = ssNone then
begin
hideScrollbar (FHScrollBar);
hideScrollbar (FVScrollBar);
exit;
end;
// preliminary width/height calculations
VHeight := Height - 4;
HWidth := Width - 4;
cw := 0;
for i := 0 to ColumnCount-1 do
cw := cw + ColumnWidth[i];
showV := False;
showH := False;
getVisWidth;
getVisLines;
// determine whether to show scrollbars for different configurations
case FScrollBarStyle of
ssHorizontal:
begin
hideScrollbar (FVScrollBar);
if not Hfits then
begin
showH := true;
getVisLines;
end;
end;
ssVertical:
begin
hideScrollbar (FHScrollBar);
if not Vfits then
begin
showV := true;
getVisWidth;
end;
end;
ssAutoBoth:
if not Vfits then
begin
showV := true;
getVisWidth;
if not Hfits then
begin
showH := true;
getVisLines;
getVisWidth;
end;
end
else if not Hfits then
begin
showH := true;
getVisLines;
if not Vfits then
begin
showV := true;
getVisWidth;
getVisLines;
end;
end;
end;
// set the scrollbar width/height space
if showV then
Dec(HWidth, FVScrollBar.Width);
if showH then
Dec(VHeight, FHScrollBar.Height);
// show or hide the scrollbars
if showV then
begin
FVScrollBar.Visible := true;
FVScrollBar.Min := 0;
if RowCount > 0 then
FVScrollBar.SliderSize := VisibleLines / RowCount
else
FVScrollBar.SliderSize := 0;
FVScrollBar.Max := RowCount-VisibleLines;
FVScrollBar.Position := FFirstRow;
FVScrollBar.RepaintSlider;
FVScrollBar.Top := 2;
FVScrollBar.Left := Width - FVScrollBar.Width - 2;
FVScrollBar.Height := VHeight;
end
else
begin
FVScrollBar.Visible := false;
if Vfits then
FFirstRow := 0;
// if vertical doesn't fit and no scrollbar, do not change firstrow
end;
if showH then
begin
FHScrollBar.Visible := true;
FHScrollBar.Min := 0;
if go_SmoothScroll in FOptions then
begin
FHScrollBar.Max := cw - vw;
FHScrollBar.Position := FXOffset;
FHScrollBar.SliderSize := HWidth / TotalColumnWidth;
FHScrollBar.PageSize := 5;
end
else
begin
FHScrollBar.Max := ColumnCount-1;
FHScrollBar.Position := FFirstCol;
FHScrollBar.SliderSize := 1 / ColumnCount;
FHScrollBar.PageSize := 1;
end;
FHScrollBar.RepaintSlider;
FHScrollBar.Top := Height -FHScrollBar.Height - 2;
FHScrollBar.Left := 2;
FHScrollBar.Width := HWidth;
end
else
begin
FHScrollBar.Visible := false;
if Hfits then
begin
FFirstCol := 0;
FXOffset := 0;
end;
// if horizontal doesn't fit and no scrollbar, do not change firstcol/xoffset
end;
FVScrollBar.UpdateWindowPosition;
FHScrollBar.UpdateWindowPosition;
end;
function TfpgBaseGrid.GetHeaderText(ACol: Integer): string;
begin
Result := 'Head ' + IntToStr(ACol);
end;
procedure TfpgBaseGrid.HandlePaint;
var
r: TfpgRect;
r2: TfpgRect;
col: Integer;
row: Integer;
clipr: TfpgRect; // clip rectangle
drawstate: TfpgGridDrawState;
cLeft: integer;
rTop: integer;
firstcol, lastcol, firstrow, lastrow : integer;
cWidths: array of integer;
begin
Canvas.ClearClipRect;
r.SetRect(0, 0, Width, Height);
case BorderStyle of
ebsNone:
begin
// do nothing
end;
ebsDefault:
begin
Canvas.DrawControlFrame(r);
InflateRect(r, -2, -2);
end;
ebsSingle:
begin
Canvas.SetColor(clShadow2);
Canvas.DrawRectangle(r);
InflateRect(r, -1, -1);
end;
end;
Canvas.SetClipRect(r);
Canvas.SetColor(FBackgroundColor);
Canvas.FillRectangle(r);
clipr.SetRect(FMargin, FMargin, VisibleWidth, VisibleHeight);
r := clipr;
cLeft := FMargin; // column starting point
rTop := FMargin; // row starting point
if go_SmoothScroll in FOptions then
begin
if FHScrollBar.Visible then
Dec(cLeft, FHScrollBar.Position);
firstcol := 0;
end
else
begin
firstcol := FFirstCol;
end;
// calculate column widths, and first/last columns
if (ColumnCount <= 0) then
begin
firstcol := -1;
lastcol := -2;
end
else
begin
setlength (cWidths, ColumnCount);
r.Left := cLeft;
for col := firstcol to ColumnCount-1 do
begin
cWidths[col] := ColumnWidth[col];
r.Width := cWidths[col];
if (go_SmoothScroll in FOptions) and (r.Left <= clipr.Left) then
begin
firstcol := col;
if col>0 then inc (cLeft, cWidths[col-1]);
end;
lastcol := col;
if r.Right >= clipr.Right then
break;
inc (r.Left, r.Width);
end;
// first/last rows...
if (RowCount <= 0) then
begin
firstrow := -1;
lastrow := -2;
end
else
begin
if ShowHeader then
inc (r.Top, FHeaderHeight);
if r.Top > clipr.Bottom then
begin
firstrow := -1;
lastrow := -2;
end
else
begin
firstrow := FFirstRow;
lastrow := firstrow + (clipr.Bottom - r.Top) div DefaultRowHeight;
if lastrow >= RowCount then
lastrow := RowCount-1;
end;
end;
end;
PrepareCells (firstrow, lastrow, firstcol, lastcol);
r.Left := cLeft;
r.Top := rTop;
if (ColumnCount > 0) and ShowHeader then
begin
// Drawing horizontal headers
r.Height := FHeaderHeight;
Canvas.SetFont(FHeaderFont);
for col := firstcol to lastcol do
begin
r.Width := cWidths[col];
Canvas.SetClipRect(clipr);
Canvas.AddClipRect(r);
DrawHeader(col, r, 0);
inc(r.Left, r.Width);
//if r.Left >= clipr.Right then
// Break; // optimization made obsolete by lastcol
end;
inc(r.Top, r.Height);
end;
if (RowCount > 0) and (ColumnCount > 0) then
begin
// Drawing cells
r.Height := DefaultRowHeight;
Canvas.SetFont(FFont);
for row := firstrow to lastrow do
begin
r.Left := cLeft;
for col := firstcol to lastcol do
begin
drawstate := [];
r.Width := cWidths[col];
Canvas.SetClipRect(clipr);
if (row = FFocusRow) and (RowSelect or (col = FFocusCol)) and not (go_HideFocusRect in FOptions) then
begin
if FFocused then
begin
Canvas.SetColor(clGridSelection);
Canvas.SetTextColor(clGridSelectionText);
end
else
begin
Canvas.SetColor(clGridInactiveSel);
Canvas.SetTextColor(clGridInactiveSelText);
end;
end
else
begin
Canvas.SetColor(GetBackgroundColor(row, col));
Canvas.SetTextColor(ColumnTextColor[col]);
end;
Canvas.AddClipRect(r);
Canvas.FillRectangle(r);
// setup drawstate
if FFocused then
Include(drawstate, gdFocused);
if (row = FFocusRow) and (col = FFocusCol) then
Include(drawstate, gdSelected);
if DoDrawCellEvent(row, col, r, drawstate) then
DrawCell(row, col, r, drawstate);
// drawing grid lines
if FShowGrid then
DrawGrid(row, col, r, 0);
inc(r.Left, r.Width);
//if r.Left >= clipr.Right then
// Break; // optimization made obsolete by lastcol
end;
// Inc(r.Top, FDefaultRowHeight+1);
inc(r.Top, r.Height);
//if r.Top >= clipr.Bottom then
// break; // optimization made obsolete by lastrow
end;
end; // item drawing
Canvas.SetClipRect(clipr);
Canvas.SetColor(FBackgroundColor);
// clearing after the last column
if r.Left <= clipr.Right then
begin
r2.Left := r.Left;
r2.Top := clipr.Top;
r2.SetRight(clipr.Right);
r2.Height := clipr.Height;
Canvas.FillRectangle(r2);
end;
// clearing after the last row
if r.Top <= clipr.Bottom then
begin
r.Left := clipr.Left;
r.Width := clipr.Width;
r.SetBottom(clipr.Bottom);
Canvas.FillRectangle(r);
end;
// The little square in the bottom right corner
if FHScrollBar.Visible and FVScrollBar.Visible then
begin
Canvas.ClearClipRect;
Canvas.SetColor(clButtonFace);
Canvas.FillRectangle(FHScrollBar.Left+FHScrollBar.Width,
FVScrollBar.Top+FVScrollBar.Height,
FVScrollBar.Width,
FHScrollBar.Height);
end;
end;
procedure TfpgBaseGrid.HandleShow;
begin
inherited HandleShow;
if (csLoading in ComponentState) then
Exit;
UpdateScrollBars;
end;
procedure TfpgBaseGrid.HandleResize(awidth, aheight: TfpgCoord);
begin
inherited HandleResize(awidth, aheight);
if (csLoading in ComponentState) then
Exit; //==>
if csUpdating in ComponentState then
Exit; //==>
if HasHandle then
UpdateScrollBars;
end;
procedure TfpgBaseGrid.HandleKeyPress(var keycode: word;
var shiftstate: TShiftState; var consumed: boolean);
var
w: integer;
r: integer;
c: integer;
begin
if consumed then
exit;
fpgApplication.HideHint;
case keycode of
keyRight:
begin
if RowSelect then
begin
w := 0;
FFocusCol := FFirstCol;
while FFocusCol < ColumnCount do
begin
inc(w, ColumnWidth[FFocusCol]+1);
if w + ColumnWidth[FFocusCol+1]+1 > VisibleWidth then
Break;
inc(FFocusCol);
end;
end;
if CanSelectCell(FFocusRow, FFocusCol+1) then
begin
inc(FFocusCol);
FollowFocus;
RePaint;
end;
consumed := True;
end;
keyLeft:
begin
if RowSelect then
FFocusCol := FFirstCol;
if CanSelectCell(FFocusRow, FFocusCol-1) then
begin
dec(FFocusCol);
FollowFocus;
RePaint;
end;
consumed := True;
end;
keyUp:
begin
if CanSelectCell(FFocusRow-1, FFocusCol) then
begin
dec(FFocusRow);
FollowFocus;
RePaint;
end;
consumed := True;
end;
keyDown:
begin
if CanSelectCell(FFocusRow+1, FFocusCol) then
begin
inc(FFocusRow);
FollowFocus;
RePaint;
end;
consumed := True;
end;
keyPageUp:
begin
r := FFocusRow-VisibleLines;
if r < 0 then
r := 0;
if (FFocusRow <> 0) and CanSelectCell(r, FFocusCol) then
begin
FFocusRow := r;
FollowFocus;
RePaint;
end;
consumed := True;
end;
keyPageDown:
begin
r := FFocusRow+VisibleLines;
if r > (RowCount-1) then
r := RowCount-1;
if (FFocusRow <> (RowCount-1)) and CanSelectCell(r, FFocusCol) then
begin
FFocusRow := r;
FollowFocus;
RePaint;
end;
consumed := True;
end;
keyHome:
begin
if FRowSelect then
begin
if (FFocusRow <> 0) and CanSelectCell(0, FFocusCol) then
begin
FFocusRow := 0;
FollowFocus;
RePaint;
end;
end
else if (FFocusCol <> 0) then
begin
{ find first selectable column }
for c := 0 to FFocusCol-1 do
if CanSelectCell(FFocusRow, c) then
begin
FFocusCol := c;
FollowFocus;
RePaint;
break;
end;
end;
consumed := True;
end;
keyEnd:
begin
if FRowSelect then
begin
if (FFocusRow <> (RowCount-1)) and CanSelectCell(RowCount-1, FFocusCol) then
begin
FFocusRow := RowCount-1;
FollowFocus;
RePaint;
end;
end
else if (FFocusCol <> (ColumnCount-1)) then
begin
for c := ColumnCount-1 downto FFocusCol+1 do
if CanSelectCell(FFocusRow, c) then
begin
FFocusCol := c;
FollowFocus;
RePaint;
break;
end;
end;
consumed := True;
end;
end; { case }
if consumed then
CheckFocusChange;
inherited HandleKeyPress(keycode, shiftstate, consumed);
end;
procedure TfpgBaseGrid.HandleMouseScroll(x, y: integer; shiftstate: TShiftState; delta: smallint);
var
lRow: Integer;
begin
inherited HandleMouseScroll(x, y, shiftstate, delta);
lRow := FFirstRow;
// If vertical scrollbar is not visible, but
// horizontal is, Mouse wheel will scroll horizontally. :)
if FHScrollBar.Visible and (not FVScrollBar.Visible) then
begin
HandleMouseHorizScroll(x, y, shiftstate, delta);
Exit;
end;
inc(FFirstRow, delta*3);
// apply limits
if FFirstRow > RowCount - VisibleLines then
FFirstRow := RowCount - VisibleLines;
if FFirstRow < 0 then
FFirstRow := 0;
if lRow <> FFirstRow then
begin
UpdateScrollBars;
RePaint;
end;
end;
procedure TfpgBaseGrid.HandleMouseHorizScroll(x, y: integer; shiftstate: TShiftState; delta: smallint);
var
lCol: Integer;
begin
inherited HandleMouseHorizScroll(x, y, shiftstate, delta);
lCol := FFirstCol;
if go_SmoothScroll in Options then
begin
;
end
else
begin
inc(FFirstCol, delta);
end;
if lCol <> FFirstCol then
begin
UpdateScrollBars;
RePaint;
end;
end;
procedure TfpgBaseGrid.HandleMouseMove(x, y: integer; btnstate: word; shiftstate: TShiftState);
var
hh: integer;
cw: integer;
n: integer;
colresize: boolean;
cLeft: integer;
c: integer;
begin
inherited HandleMouseMove(x, y, btnstate, shiftstate);
if (ColumnCount = 0) or (RowCount = 0) then
Exit; //==>
if FColResizing then
begin
if (btnstate and 1) = 0 then
FColResizing := False
else
begin
cw := (ColumnWidth[FResizedCol]+x)-FDragPos;
if cw < 1 then
cw := 1;
SetColumnWidth(FResizedCol, cw);
FDragPos := x;
end;
end
else if ShowHeader then
begin
colresize := False;
hh := FHeaderHeight;
cLeft := FMargin; // column starting point
if go_SmoothScroll in FOptions then
begin
if FHScrollBar.Visible then
Dec(cLeft, FHScrollBar.Position);
c := 0;
end
else
begin
c := FFirstCol;
end;
if (y <= FMargin + hh) then // we are over the Header row
begin
cw := 0;
for n := c to ColumnCount-1 do
begin
inc(cw, ColumnWidth[n]);
// Resizing is enabled 4 pixel either way of the cell border
if ((x >= (cLeft+cw-4)) and (x <= (cLeft+cw+4))) then
begin
colresize := True;
Break;
end;
{ TODO: We could optimize this slightly by breaking as soon as x is
greater than current column edge we are over. }
end; { if }
end; { if/else }
if colresize then
MouseCursor := mcSizeEW
else
MouseCursor := mcDefault;
end; { if/else }
end;
procedure TfpgBaseGrid.HandleLMouseUp(x, y: integer; shiftstate: TShiftState);
begin
inherited HandleLMouseUp(x, y, shiftstate);
{$IFDEF DEBUG}
if FColResizing then
Writeln('Column ', FResizedCol,' width = ', ColumnWidth[FResizedCol]);
{$ENDIF}
FColResizing := False;
MouseCursor := mcDefault;
end;
procedure TfpgBaseGrid.HandleLMouseDown(x, y: integer; shiftstate: TShiftState);
var
hh: integer;
n: Integer;
cw: integer;
nw: integer;
prow: Integer;
pcol: Integer;
c: integer;
cLeft: integer;
begin
inherited HandleLMouseDown(x, y, shiftstate);
if (ColumnCount = 0) or (RowCount = 0) then
Exit; //==>
pcol := FFocusCol;
prow := FFocusRow;
// searching for the appropriate character position
if ShowHeader then
hh := FHeaderHeight+1
else
hh := 0;
if ShowHeader and (y <= FMargin+hh) then // inside Header row
begin
{$IFDEF DEBUG} Writeln('header click...'); {$ENDIF}
cLeft := FMargin; // column starting point
if go_SmoothScroll in FOptions then
begin
if FHScrollBar.Visible then
Dec(cLeft, FHScrollBar.Position);
c := 0;
end
else
begin
c := FFirstCol;
end;
cw := 0;
for n := c to ColumnCount-1 do
begin
inc(cw, ColumnWidth[n]);
if (x >= (cLeft+cw-4)) and (x <= (cLeft+cw+4)) then
begin
{$IFDEF DEBUG} Writeln('column resize...'); {$ENDIF}
FColResizing := True;
FResizedCol := n;
FDragPos := x;
Exit;
end; { if/else }
{ TODO: We could optimize this slightly by breaking as soon as x is
greater than current column edge we are over. }
end; { for }
end
else
begin // Selecting a Cell via mouse
MouseToCell(x, y, FFocusCol, FFocusRow);
end; { if/else }
if not CanSelectCell(FFocusRow, FFocusCol) then
begin
// restore previous values
FFocusRow := prow;
FFocusCol := pcol;
end;
if (prow <> FFocusRow) or (pcol <> FFocusCol) then
begin
FollowFocus;
Repaint;
end;
if FColResizing then
MouseCursor := mcSizeEW;
CheckFocusChange;
end;
procedure TfpgBaseGrid.HandleRMouseUp(x, y: integer; shiftstate: TShiftState);
var
hh: integer;
begin
inherited HandleRMouseUp(x, y, shiftstate);
if Assigned(PopupMenu) then
begin
// popup should not appear if you clicked in header - maybe this behaviour should be user-selectable?
if ShowHeader then
hh := FHeaderHeight+1
else
hh := 0;
if ShowHeader and (y > FMargin+hh) then // not in Header row
begin
PopupMenu.ShowAt(self, x, y);
end;
end;
end;
procedure TfpgBaseGrid.FollowFocus;
var
n: Integer;
w: TfpgCoord;
begin
if (RowCount > 0) and (FFocusRow < 0) then
FFocusRow := 0;
if FFocusRow > RowCount-1 then
FFocusRow := RowCount-1;
if (ColumnCount > 0) and (FFocusCol < 0) then
FFocusCol := 0;
if FFocusCol > ColumnCount-1 then
FFocusCol := ColumnCount-1;
if FFirstRow < 0 then
FFirstRow := 0;
if FFirstCol < 0 then
FFirstCol := 0;
if FFocusRow < FFirstRow then
FFirstRow := FFocusRow
else
begin
if (FFirstRow + VisibleLines) <= FFocusRow then
FFirstRow := (FFocusRow - VisibleLines) + 1; // scroll last partial row into view
end; { if/else }
if FFocusCol < FFirstCol then
FFirstCol := FFocusCol
else
begin
w := 0;
for n := FFocusCol downto FFirstCol do
begin
w := w + ColumnWidth[n]+1;
if w > VisibleWidth then
begin
if n = FFocusCol then
FFirstCol := n
else
FFirstCol := n+1;
break;
end;
end; { for }
end; { if/else }
CheckFocusChange;
UpdateScrollBars;
end;
procedure TfpgBaseGrid.PrepareCells(firstrow, lastrow, firstcol, lastcol: integer);
begin
// for descendents
end;
constructor TfpgBaseGrid.Create(AOwner: TComponent);
begin
Updating;
inherited Create(AOwner);
Focusable := True;
Width := 120;
Height := 80;
FFocusCol := -1;
FPrevCol := -1;
FFocusRow := -1;
FPrevRow := -1;
FFirstRow := 0;
FFirstCol := 0;
FMargin := 2;
FShowHeader := True;
FShowGrid := True;
FRowSelect := False;
FScrollBarStyle := ssAutoBoth;
FUpdateCount := 0;
FOptions := [];
FHeaderStyle := ghsButton;
FBorderStyle := ebsDefault;
FFont := fpgGetFont('#Grid');
FHeaderFont := fpgGetFont('#GridHeader');
FTemp := 50; // Just to prove that ColumnWidth does adjust.
FDefaultColWidth := 64;
FDefaultRowHeight := FFont.Height + 2;
FHeaderHeight := FHeaderFont.Height + 2;
FBackgroundColor := clBoxColor;
FAlternativeBGColor := clHilite1;
FColResizing := False;
MinHeight := HeaderHeight + DefaultRowHeight + FMargin;
MinWidth := DefaultColWidth + FMargin;
FVScrollBar := TfpgScrollBar.Create(self);
FVScrollBar.Orientation := orVertical;
FVScrollBar.Visible := False;
FVScrollBar.OnScroll := @VScrollBarMove;
FHScrollBar := TfpgScrollBar.Create(self);
FHScrollBar.Orientation := orHorizontal;
FHScrollBar.Visible := False;
FHScrollBar.OnScroll := @HScrollBarMove;
FHScrollBar.ScrollStep := 5;
end;
destructor TfpgBaseGrid.Destroy;
begin
FOnRowChange := nil;
FOnFocusChange := nil;
FFont.Free;
FHeaderFont.Free;
inherited Destroy;
end;
procedure TfpgBaseGrid.AfterConstruction;
begin
inherited AfterConstruction;
Updated;
end;
procedure TfpgBaseGrid.Update;
begin
if csUpdating in ComponentState then
Exit;
UpdateScrollBars;
RePaint;
end;
procedure TfpgBaseGrid.BeginUpdate;
begin
Inc(FUpdateCount);
Updating;
end;
procedure TfpgBaseGrid.EndUpdate;
begin
if FUpdateCount > 0 then
begin
Dec(FUpdateCount);
if FUpdateCount = 0 then
begin
Updated;
// RePaint;
Update;
end;
end;
end;
procedure TfpgBaseGrid.MouseToCell(X, Y: Integer; var ACol, ARow: Integer);
var
hh: integer;
cw: integer;
n: Integer;
cLeft: integer;
c: integer;
begin
if ShowHeader then
hh := FHeaderHeight+1
else
hh := 0;
ARow := FFirstRow + ((y - FMargin - hh) div FDefaultRowHeight);
if ARow > RowCount-1 then
ARow := RowCount-1;
cLeft := FMargin; // column starting point
if go_SmoothScroll in FOptions then
begin
if FHScrollBar.Visible then
Dec(cLeft, FHScrollBar.Position);
c := 0;
end
else
begin
c := FFirstCol;
end;
cw := 0;
for n := c to ColumnCount-1 do
begin
inc(cw, ColumnWidth[n]);
if cLeft+cw >= x then
begin
ACol := n;
Break;
end;
end;
end;
end.
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