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{
fpGUI - Free Pascal GUI Library
Copyright (C) 2006 - 2007 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:
This is where all style related types should be defined. The base
Style class should also be defined here.
This is still work in progress!
}
unit gui_style;
{$mode objfpc}{$H+}
interface
uses
Classes,
SysUtils,
gfxbase,
fpgfx,
gfx_widget;
type
TfpgPrimitiveElement = (
peFocusRectangle, // The focus rectangle
pePanel, // Generic bevel of a panel
pePanelButtonBevel, // The bevel of a button
pePanelEditBox, // Frame around a text edit box
peFrameMenu, // Frame for popup windows and menus
pePanelMenuBar, // The menu bar panel
pePanelScrollAreaCorner, // Panel at the bottom right corner of the scroll area
peFrameDefaultButton, // Frame around a default button like in a dialog
peFramePageControl, // Frame for a Page Control
peIndicatorArrowUp, // Generic up arrow
peIndicatorArrowDown, // Generic down arrow
peIndicatorArrowRight, // Generic right arrow
peIndicatorArrowLeft, // Generic left arrow
peIndicatorCheckBox, // On/off indicator used in a CheckBox
peIndicatorRadioButton, // Exclusive on indicator used in a Radio Button
peIndicatorHeaderArrow, // Indicator used in List or Tabel header to show sorting
peIndicatorMenuCheckMark, // Check mark used in menus
peIndicatorProgressBar // Body section of a Progress Bar
);
TfpgControlElement = (
cePushButton, // The Bevel, Label and FocusRect
cePushButtonBevel,
cePushButtonLabel,
ceRadioButton, // Indicator, FocusRect and Label
ceRadioButtonLabel,
ceCheckBox, // Indicator, FocusRect and Label
ceCheckBoxLabel,
ceMenuItem,
ceMenuBarItem,
ceMenuBarEmptyArea,
ceMenuTearOff,
ceMenuHMargin,
ceMenuVMargin,
ceProgressBar,
cePageControlTab, // Both the Shape and Label
cePageControlShape,
cePageControlLabel
);
TfpgStyleOptionEnum = (
soDefault,
soFocusRect,
soButton,
soComboBox,
soCheckBox,
soMenuItem,
soTrackBar,
soPanel,
soComplex
);
TfpgStateItem = (
stNone,
stActive,
stReadOnly,
stSelected,
stRaised,
stLowered,
stHasFocus,
stEnabled
);
TfpgState = set of TfpgStateItem;
// Just a data class
TfpgStyleOption = class(TObject)
private
FRect: TfpgRect;
FState: TfpgState;
FStyleOption: TfpgStyleOptionEnum;
public
property StyleOption: TfpgStyleOptionEnum read FStyleOption write FStyleOption;
property Rect: TfpgRect read FRect write FRect;
property State: TfpgState read FState write FState;
end;
TfpgButtonFeatures = set of (bfNone, bfFlat, bfDefault);
// Button specific options
TfpgButtonStyleOption = class(TfpgStyleOption)
private
FButtonFeatures: TfpgButtonFeatures;
public
property ButtonFeatures: TfpgButtonFeatures read FButtonFeatures write FButtonFeatures;
end;
TfpgBaseStyle = class(TObject)
public
procedure DrawControl(element: TfpgControlElement; const option: TfpgStyleOption; canvas: TfpgCanvas; widget: TfpgWidget = nil); virtual; abstract;
procedure DrawPrimitive(element: TfpgPrimitiveElement; const option: TfpgStyleOption; canvas: TfpgCanvas; widget: TfpgWidget = nil); virtual; abstract;
end;
//-----------------------------------------
// The classes below will be better placed in their own units!
// This class encapsulates the common look and feel of the GUI
TfpgCommonStyle = class(TfpgBaseStyle)
public
procedure DrawControl(element: TfpgControlElement; const option: TfpgStyleOption; canvas: TfpgCanvas; widget: TfpgWidget=nil); override;
procedure DrawPrimitive(element: TfpgPrimitiveElement; const option: TfpgStyleOption; canvas: TfpgCanvas; widget: TfpgWidget=nil); override;
end;
// The Windows 2000 look
TfpgWin2000Style = class(TfpgCommonStyle)
end;
TfpgWinXPStyle = class(TfpgCommonStyle)
end;
// This class provides a widgte style similar to the classic BlueCurve theme
// originally created by Red Hat.
TfpgBluecurveStyle = class(TfpgCommonStyle)
end;
// This class provides a widget style similar to GNOME
TfpgClearLookStyle = class(TfpgCommonStyle)
end;
// For the die-hard unix fans!
TfpgMotifStyle = class(TfpgCommonStyle)
end;
implementation
{ TfpgCommonStyle }
procedure TfpgCommonStyle.DrawControl(element: TfpgControlElement;
const option: TfpgStyleOption; canvas: TfpgCanvas; widget: TfpgWidget);
begin
// Do common things here
end;
procedure TfpgCommonStyle.DrawPrimitive(element: TfpgPrimitiveElement;
const option: TfpgStyleOption; canvas: TfpgCanvas; widget: TfpgWidget);
begin
// Do common things here. It's going to be a huge case statement. This design
// allows us to add new controls or elements without having to instantly
// implement them in all descendant classes!
case element of
peFocusRectangle:
begin
canvas.DrawFocusRect(option.Rect);
end;
peIndicatorRadioButton:
begin // just an example!!!!!!!!
canvas.SetColor(clShadow1);
canvas.DrawArc(option.Rect.Left, option.Rect.Top, option.Rect.Width, option.Rect.Height, 0, 180);
canvas.SetColor(clHilite1);
canvas.DrawArc(option.Rect.Left, option.Rect.Top, option.Rect.Width, option.Rect.Height, 180, 0);
end;
end;
end;
end.
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