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FMX.ListBox1.pas
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{*******************************************************}
{ }
{ Delphi FireMonkey Platform }
{ }
{ Copyright(c) 2011-2023 Embarcadero Technologies, Inc. }
{ All rights reserved }
{ }
{*******************************************************}
unit FMX.ListBox;
interface
{$SCOPEDENUMS ON}
uses
System.Classes, System.Types, System.UITypes, System.SysUtils, System.Rtti, System.Generics.Collections,
System.ImageList, FMX.Types, FMX.ActnList, FMX.StdCtrls, FMX.Layouts, FMX.Objects, FMX.Pickers, FMX.Controls,
FMX.Graphics, FMX.ListBox.Selection, FMX.ImgList;
type
TCustomListBox = class;
TCustomComboBox = class;
TListBoxItemData = class;
TListBoxItemStyleDefaults = class;
TListBoxSelector = class;
{ TListBoxItem }
TListBoxItem = class(TTextControl, IGlyph)
private type
TBackgroundShape = (SeparatorBottom, Sharp, RoundTop, RoundBottom, RoundAll);
private
FIsChecked: Boolean;
FCheck: TCheckBox;
FIsSelected: Boolean;
FIsSelectable: Boolean;
FData: TObject;
FItemData: TListBoxItemData;
FBitmap: TBitmap;
FIcon: TImage;
FOldIconVisible: Boolean;
FOldCheckAlign: TAlignLayout;
FGlyph: TGlyph;
FBackgroundShape: TBackgroundShape;
FImageLink: TGlyphImageLink;
procedure SetIsChecked(const Value: Boolean);
procedure DoCheckClick(Sender: TObject);
procedure InitCheckBox(Visible: Boolean);
procedure UpdateCheck;
procedure SetIsSelected(const Value: Boolean);
procedure SetSelectable(const Value: Boolean);
function GetImages: TCustomImageList;
procedure SetImages(const Value: TCustomImageList);
{ IGlyph }
function GetImageIndex: TImageIndex;
procedure SetImageIndex(const Value: TImageIndex);
function GetImageList: TBaseImageList; inline;
procedure SetImageList(const Value: TBaseImageList);
function IGlyph.GetImages = GetImageList;
procedure IGlyph.SetImages = SetImageList;
procedure SetItemData(const Value: TListBoxItemData);
protected
procedure ChangeOrder; override;
function ListBox: TCustomListBox;
function ComboBox: TCustomComboBox;
function GetDefaultSize: TSizeF; override;
procedure ApplyStyle; override;
procedure FreeStyle; override;
function EnterChildren(AObject: IControl): Boolean; override;
procedure DragOver(const Data: TDragObject; const Point: TPointF; var Operation: TDragOperation); override;
procedure DragEnd; override;
procedure Paint; override;
function GetHeight: Single; override;
function GetWidth: Single; override;
procedure SetHeight(const Value: Single); override;
function DoSetSize(const ASize: TControlSize; const NewPlatformDefault: Boolean; ANewWidth, ANewHeight: Single;
var ALastWidth, ALastHeight: Single): Boolean; override;
procedure SelectBackground(const Shape: TBackgroundShape);
procedure OnBitmapChanged(Sender: TObject);
function StyledSettingsStored: Boolean; override;
property Align;
property RotationAngle;
property RotationCenter;
function GetTextSettingsClass: TTextSettingsInfo.TCustomTextSettingsClass; override;
function GetDefaultStyleLookupName: string; override;
function DoGetDefaultStyleLookupName(const Defaults: TListBoxItemStyleDefaults): string; virtual;
/// <summary> Should be called when you change an instance or reference to instance of <b>TBaseImageList</b> or the
/// <b>ImageIndex</b> property
/// <para>See also <b>FMX.ActnList.IGlyph</b></para></summary>
procedure ImagesChanged; virtual;
/// <summary> Determines whether the <b>ImageIndex</b> property needs to be stored in the fmx-file</summary>
/// <returns> <c>True</c> if the <b>ImageIndex</b> property needs to be stored in the fmx-file</returns>
function ImageIndexStored: Boolean; virtual;
procedure SetVisible(const Value: Boolean); override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
property Data: TObject read FData write FData;
function GetParentComponent: TComponent; override;
procedure ApplyTriggerEffect(const AInstance: TFmxObject; const ATrigger: string); override;
/// <summary>Used internally to modify Selected state of an item</summary>
procedure SetIsSelectedInternal(const Value: Boolean; const UserChange: Boolean);
property Font;
property TextAlign;
property WordWrap;
///<summary> The list of images. Can be <c>nil</c>. <para>See also <b>FMX.ActnList.IGlyph</b></para></summary>
property Images: TCustomImageList read GetImages;
published
property AutoTranslate default True;
property ClipChildren;
property ClipParent;
property Cursor;
property DragMode;
property EnableDragHighlight;
property Selectable: Boolean read FIsSelectable write SetSelectable default True;
property TextSettings;
property StyledSettings;
property Locked;
property Height;
property HelpContext;
property HelpKeyword;
property HelpType;
property HitTest default False;
property IsChecked: Boolean read FIsChecked write SetIsChecked default False;
property IsSelected: Boolean read FIsSelected write SetIsSelected default False;
property ItemData: TListBoxItemData read FItemData write SetItemData;
///<summary> Zero based index of an image. The default is <c>-1</c>.
///<para> See also <b>FMX.ActnList.IGlyph</b></para></summary>
///<remarks> If non-existing index is specified, an image is not drawn and no exception is raised</remarks>
property ImageIndex: TImageIndex read GetImageIndex write SetImageIndex stored ImageIndexStored;
property Padding;
property Opacity;
property Margins;
property PopupMenu;
property Position;
property Scale;
property Size;
property StyleLookup;
property TabOrder;
property TabStop;
property Text;
property Width;
property Visible;
property ParentShowHint;
{events}
property OnApplyStyleLookup;
{Drag and Drop events}
property OnDragEnter;
property OnDragLeave;
property OnDragOver;
property OnDragDrop;
property OnDragEnd;
{Mouse events}
property OnMouseDown;
property OnMouseMove;
property OnMouseUp;
property OnMouseWheel;
property OnMouseEnter;
property OnMouseLeave;
property OnClick;
property OnPainting;
property OnPaint;
property OnResize;
property OnResized;
end;
{ TListBoxItemData }
TListBoxItemData = class(TPersistent)
public type
TAccessory = (aNone=0, aMore=1, aDetail=2, aCheckmark=3);
strict private
const
StyleSelectorMore = 'accessorymore.Visible';
StyleSelectorDetail = 'accessorydetail.Visible';
StyleSelectorCheckmark = 'accessorycheckmark.Visible';
private
[Weak] FItem: TListBoxItem;
FAccessory: TAccessory;
procedure SetText(const Text: String);
function GetText: String;
procedure SetDetail(const Detail: String);
function GetDetail: String;
procedure SetBitmap(const Bitmap: TBitmap);
function GetBitmap: TBitmap;
function GetAccessory: TAccessory;
procedure SetAccessory(const Accessory: TAccessory);
public
constructor Create(const HostItem: TListBoxItem);
destructor Destroy; override;
procedure Assign(Source: TPersistent); override;
procedure Disappear;
published
property Text: string read GetText write SetText stored false;
property Detail: string read GetDetail write SetDetail;
property Accessory: TAccessory read GetAccessory write SetAccessory default TAccessory.aNone;
property Bitmap: TBitmap read GetBitmap write SetBitmap;
end;
{ TCustomListBox }
TListStyle = (Vertical, Horizontal);
TListGroupingKind = (Plain, Grouped);
TOnCompareListBoxItemEvent = procedure(Item1, Item2: TListBoxItem; var Result: Integer) of object;
TOnListBoxDragChange = procedure(SourceItem, DestItem: TListBoxItem; var Allow: Boolean) of object;
TListBoxItemStyleDefaults = class(TPersistent)
strict private
FItemStyle : string;
FHeaderStyle : string;
FFooterStyle : string;
[Weak] FListBox: TCustomListBox;
private
function GetItemStyle: string;
procedure SetItemStyle(const Value: string);
function GetGroupHeaderStyle: string;
procedure SetGroupHeaderStyle(const Value: string);
function GetGroupFooterStyle: string;
procedure SetGroupFooterStyle(const Value: string);
procedure RefreshListBox;
constructor Create(const ListBox: TCustomListBox);
public
procedure Assign(Source: TPersistent); override;
property ListBox: TCustomListBox read FListBox;
published
property ItemStyle: string read GetItemStyle write SetItemStyle nodefault;
property GroupHeaderStyle: string read GetGroupHeaderStyle write SetGroupHeaderStyle nodefault;
property GroupFooterStyle: string read GetGroupFooterStyle write SetGroupFooterStyle nodefault;
end;
TMultiSelectStyle = (None, Default, Extended);
TCustomListBox = class(TScrollBox, IItemsContainer, IInflatableContent<TListBoxItem>, ISearchResponder, IGlyph)
private const
UnfocusedSelectionOpacity = 0.7;
ExtendedSelectionOpacity = 0.7;
public type
TStringsChangeOp = (Added, Deleted, Clear);
TStringsChangedEvent = procedure(const S: String; const StringsEvent: TCustomListBox.TStringsChangeOp) of object;
TItemClickEvent = procedure(const Sender: TCustomListBox; const Item: TListBoxItem) of object;
private type
TListBoxStrings = class(TStrings)
private
[Weak] FListBox: TCustomListBox;
procedure ReadData(Reader: TReader);
procedure WriteData(Writer: TWriter);
protected
procedure Put(Index: Integer; const S: string); override;
function Get(Index: Integer): string; override;
function GetCount: Integer; override;
function GetObject(Index: Integer): TObject; override;
procedure PutObject(Index: Integer; AObject: TObject); override;
procedure SetUpdateState(Updating: Boolean); override;
procedure DefineProperties(Filer: TFiler); override;
public
function Add(const S: string): Integer; override;
procedure Clear; override;
procedure Delete(Index: Integer); override;
procedure Exchange(Index1, Index2: Integer); override;
function IndexOf(const S: string): Integer; override;
procedure Insert(Index: Integer; const S: string); override;
end;
TGroup = record
First: Integer;
Length: Integer;
constructor Create(const AFirst, ALength: Integer);
end;
TGroups = class(TList<TGroup>)
public
function FindGroup(const Index: Integer): Integer;
end;
/// <summary>
/// Visual display of the selection based on style controls. It makes copies of specified style object,
/// which represent selection for focused and unfocused states. And align styled selection in specified positions.
/// </summary>
TStyledSelection = class
private
FListBox: TCustomListBox;
FUnfocusedObjectsPool: TControlList;
FFocusedObjectsPool: TControlList;
FCurrentObjects: TControlList; // Reference
FIsFocused: Boolean;
{ Style objects }
FUnfocusedSelection: TControl;
FFocusedSelection: TControl;
procedure SetIsFocused(const Value: Boolean);
private
function CreateSelectionControl(const AIsFocused: Boolean): TControl;
public
constructor Create(const AListBox: TCustomListBox);
destructor Destroy; override;
/// <summary>Aligns the style selection controls according to the passed areas.</summary>
procedure Realign(const ASelectionRects: TList<TRectF>);
/// <summary>Clear all style selection controls for focused and unfocused states.</summary>
procedure ClearPools;
public
/// <summary>The reference on style object that is used to create controls for unfocused selection.</summary>
property UnfocusedSelection: TControl read FUnfocusedSelection write FUnfocusedSelection;
/// <summary>The reference on style object that is used to create controls for focused selection.</summary>
property FocusedSelection: TControl read FFocusedSelection write FFocusedSelection;
property IsFocused: Boolean read FIsFocused write SetIsFocused;
end;
strict private
FBeingPainted: Boolean;
FRealignRequested: Boolean;
FUpdateGroupsRequested: Boolean;
FToInflate: TList<TListBoxItem>;
FInflater: TContentInflater<TListBoxItem>;
FStringsChanged: TStringsChangedEvent;
FOnItemClick: TItemClickEvent;
[Weak] FItemDown: TListBoxItem;
FOnChange: TNotifyEvent;
FShowCheckboxes: Boolean;
FOnChangeCheck: TNotifyEvent;
FSorted: Boolean;
FOnCompare: TOnCompareListBoxItemEvent;
FAlternatingRowBackground: Boolean;
FAllowDrag: Boolean;
FOnDragChange: TOnListBoxDragChange;
FNoItemsContent: TContent;
FHeaderCompartment: TContent;
FFooterCompartment: TContent;
FContentOverlay: TContent;
FDefaultStyles: TListBoxItemStyleDefaults;
FGroups: TGroups;
FGroupingKind: TListGroupingKind;
FClickEnable: Boolean;
FSelection: TControl;
FExtendedSelection: TControl;
FFocusedSelection: TControl;
FSelector: TListBoxSelector;
FImageLink: TGlyphImageLink;
[Weak] FImages: TCustomImageList;
function GetInflatableItems: TList<TListBoxItem>;
procedure CalcSelectionRects(const SelRects: TList<TRectF>);
procedure PerformInternalDrag;
function GetImages: TCustomImageList;
procedure SetImages(const Value: TCustomImageList);
{ IGlyph }
function GetImageIndex: TImageIndex;
procedure SetImageIndex(const Value: TImageIndex);
function GetImageList: TBaseImageList; inline;
procedure SetImageList(const Value: TBaseImageList);
function IGlyph.GetImages = GetImageList;
procedure IGlyph.SetImages = SetImageList;
private
FDragItem: TListBoxItem;
FFirstVisibleItem, FLastVisibleItem: Integer;
FItems: TStrings;
FColumns: Integer;
FItemWidth: Single;
FItemHeight: Single;
FListStyle: TListStyle;
FOddFill: TBrush;
FContentInsets: TRectF;
FSelectionObjects: TStyledSelection;
procedure IgnoreString(Reader: TReader);
procedure ReadMultiSelect(Reader: TReader);
function GetCount: Integer;
function GetSelected: TListBoxItem;
procedure SetColumns(const Value: Integer);
procedure SetItemHeight(const Value: Single);
procedure SetItemWidth(const Value: Single);
procedure SetListStyle(const Value: TListStyle);
procedure SetShowCheckboxes(const Value: Boolean);
function GetListItem(Index: Integer): TListBoxItem;
procedure SetSorted(const Value: Boolean);
procedure SetAlternatingRowBackground(const Value: Boolean);
procedure SetItems(const Value: TStrings);
procedure SetMultiSelectStyle(const Value: TMultiSelectStyle);
function GetMultiSelectStyle: TMultiSelectStyle;
procedure SetAllowDrag(const Value: Boolean);
function GetMultiSelect: Boolean;
procedure SetMultiSelect(const Value: Boolean);
{ IItemsContainer }
function IItemsContainer.GetItemsCount = GetCount;
function GetItem(const AIndex: Integer): TFmxObject;
function GetFilterPredicate: TPredicate<string>;
procedure SetFilterPredicate(const Predicate: TPredicate<string>);
procedure SetItemDown(const Value: TListBoxItem);
function ItemsStored: Boolean;
protected
procedure DefineProperties(Filer: TFiler); override;
function GetData: TValue; override;
procedure SetData(const Value: TValue); override;
function CanObserve(const ID: Integer): Boolean; override;
procedure DoChangeCheck(const Item: TListBoxItem); dynamic;
function CompareItems(const Item1, Item2: TListBoxItem): Integer; virtual;
procedure DoChange; dynamic;
procedure SortItems; virtual;
/// <summary>Set active selection to item with given index.</summary>
procedure SetItemIndex(const Value: Integer); virtual;
/// <summary>Return index of currently selected Item</summary>
function GetItemIndex: Integer; virtual;
procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Single); override;
procedure MouseMove(Shift: TShiftState; X, Y: Single); override;
procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Single); override;
procedure MouseClick(Button: TMouseButton; Shift: TShiftState; X, Y: Single); override;
procedure KeyDown(var Key: Word; var KeyChar: System.WideChar; Shift: TShiftState); override;
procedure DragOver(const Data: TDragObject; const Point: TPointF; var Operation: TDragOperation); override;
procedure DragDrop(const Data: TDragObject; const Point: TPointF); override;
function GetDefaultSize: TSizeF; override;
procedure ApplyStyle; override;
procedure FreeStyle; override;
procedure DoEnter; override;
procedure DoExit; override;
procedure DoAddObject(const AObject: TFmxObject); override;
procedure DoInsertObject(Index: Integer; const AObject: TFmxObject); override;
procedure DoRemoveObject(const AObject: TFmxObject); override;
function GetBorderHeight: Single;
function CreateScrollContent: TScrollContent; override;
function DoCalcContentBounds: TRectF; override;
procedure DoEndUpdate; override;
/// <summary> Should be called when you change an instance or reference to instance of <b>TBaseImageList</b> or the
/// <b>ImageIndex</b> property
/// <para>See also <b>FMX.ActnList.IGlyph</b></para></summary>
procedure ImagesChanged; virtual;
procedure Loaded; override;
procedure DoContentPaint(Sender: TObject; Canvas: TCanvas; const ARect: TRectF);
procedure Painting; override;
procedure AfterPaint; override;
procedure ViewportPositionChange(const OldViewportPosition, NewViewportPosition: TPointF;
const ContentSizeChanged: Boolean); override;
procedure DoUpdateAniCalculations(const AAniCalculations: TScrollCalculations); override;
function IsAddToContent(const AObject: TFmxObject): Boolean; override;
procedure ContentAddObject(const AObject: TFmxObject); override;
procedure ContentInsertObject(Index: Integer; const AObject: TFmxObject); override;
procedure ContentBeforeRemoveObject(AObject: TFmxObject); override;
procedure ContentRemoveObject(const AObject: TFmxObject); override;
function IsOpaque: Boolean; override;
procedure UpdateVisibleItems;
procedure UpdateSelection;
procedure UpdateGroups;
procedure RealUpdateGroups; virtual;
procedure UpdateStickyHeader;
procedure SetGroupingKind(const Value: TListGroupingKind);
procedure DoRealign; override;
procedure DispatchStringsChangeEvent(const S: String; const Op: TStringsChangeOp);
procedure Show; override;
property CanFocus default True;
property CanParentFocus;
property Selection: TControl read FSelection;
procedure Notification(AComponent: TComponent; Operation: TOperation); override;
/// <summary>Property getter FirstSelectedItem</summary>
function GetFirstSelect: TListBoxItem;
property AllowDrag: Boolean read FAllowDrag write SetAllowDrag default False;
property AlternatingRowBackground: Boolean read FAlternatingRowBackground write SetAlternatingRowBackground default False;
property Columns: Integer read FColumns write SetColumns default 1;
property ItemWidth: Single read FItemWidth write SetItemWidth;
property ItemHeight: Single read FItemHeight write SetItemHeight;
property ListStyle: TListStyle read FListStyle write SetListStyle
default TListStyle.Vertical;
property MultiSelectStyle: TMultiSelectStyle read GetMultiSelectStyle write SetMultiSelectStyle default TMultiSelectStyle.None;
property Sorted: Boolean read FSorted write SetSorted default False;
property ShowCheckboxes: Boolean read FShowCheckboxes write SetShowCheckboxes default False;
/// <summary>First item in the selection or nil if nothing is selected</summary>
property FirstSelectedItem: TListBoxItem read GetFirstSelect;
property OnChange: TNotifyEvent read FOnChange write FOnChange;
property OnChangeCheck: TNotifyEvent read FOnChangeCheck write FOnChangeCheck;
property OnCompare: TOnCompareListBoxItemEvent read FOnCompare write FOnCompare;
property OnDragChange: TOnListBoxDragChange read FOnDragChange write FOnDragChange;
property OnStringsChanged: TStringsChangedEvent read FStringsChanged write FStringsChanged;
/// <summary>Current selection controller. Selector is chosen by MultiSelectStyle property.</summary>
property SelectionController: TListBoxSelector read FSelector;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure Assign(Source: TPersistent); override;
procedure Clear; virtual;
function DragChange(const SourceItem, DestItem: TListBoxItem): Boolean; dynamic;
procedure SelectAll;
procedure ClearSelection;
procedure SelectRange(const Item1, Item2: TListBoxItem);
///<summary>Scroll the view to make Item visible</summary>
procedure ScrollToItem(const Item: TListBoxItem);
function FirstSelectedItemFrom(const Item: TListboxItem): TListBoxItem;
function LastSelectedItemFrom(const Item: TListboxItem): TListBoxItem;
function ItemByPoint(const X, Y: Single): TListBoxItem;
function ItemByIndex(const Idx: Integer): TListBoxItem;
procedure ItemsExchange(Item1, Item2: TListBoxItem);
procedure Sort(Compare: TFmxObjectSortCompare); override;
procedure NotifyInflated;
property BorderHeight: Single read GetBorderHeight;
property Count: Integer read GetCount;
property Selected: TListBoxItem read GetSelected;
property Items: TStrings read FItems write SetItems stored ItemsStored;
property ItemDown: TListBoxItem read FItemDown write SetItemDown;
///<summary> The list of images. Can be <c>nil</c>. <para>See also <b>FMX.ActnList.IGlyph</b></para></summary>
property Images: TCustomImageList read GetImages write SetImages;
property ListItems[Index: Integer]: TListBoxItem read GetListItem;
property ItemIndex: Integer read GetItemIndex write SetItemIndex default -1;
property GroupingKind: TListGroupingKind read FGroupingKind write SetGroupingKind default TListGroupingKind.Plain;
property FilterPredicate: TPredicate<string> read GetFilterPredicate write SetFilterPredicate stored False;
property MultiSelect: Boolean read GetMultiSelect write SetMultiSelect; // deprecated - use MultiSelectStyle
property DefaultItemStyles: TListBoxItemStyleDefaults read FDefaultStyles write FDefaultStyles;
property OnItemClick: TItemClickEvent read FOnItemClick write FOnItemClick;
end;
{ TListBox }
TListBox = class(TCustomListBox)
published
property Align;
property AllowDrag;
property AlternatingRowBackground;
property Anchors;
property CanFocus;
property CanParentFocus;
property ClipChildren;
property ClipParent;
property Columns;
property Cursor;
property DisableFocusEffect;
property DragMode;
property EnableDragHighlight;
property Enabled;
property Locked;
property Height;
property HitTest;
property Hint;
property ItemIndex;
property ItemHeight;
property Items;
property ItemWidth;
property Images;
property DefaultItemStyles;
property GroupingKind;
property ListStyle;
property Padding;
property MultiSelectStyle;
property Opacity;
property Margins;
property PopupMenu;
property Position;
property RotationAngle;
property RotationCenter;
property Scale;
property Size;
property ShowCheckboxes;
property Sorted;
property StyleLookup;
property TabOrder;
property TabStop;
property Visible;
property Width;
property ParentShowHint;
property ShowHint;
{events}
property OnApplyStyleLookup;
property OnChange;
property OnChangeCheck;
property OnCompare;
{Drag and Drop events}
property OnDragChange;
property OnDragEnter;
property OnDragLeave;
property OnDragOver;
property OnDragDrop;
property OnDragEnd;
{Keyboard events}
property OnKeyDown;
property OnKeyUp;
{Mouse events}
property OnCanFocus;
property OnItemClick;
property OnEnter;
property OnExit;
property OnMouseDown;
property OnMouseMove;
property OnMouseUp;
property OnMouseWheel;
property OnMouseEnter;
property OnMouseLeave;
property OnPainting;
property OnPaint;
property OnResize;
property OnResized;
end;
TListBoxHeader = class(TToolBar, IListBoxHeaderTrait)
protected
function GetDefaultStyleLookupName: string; override;
public
end;
TListBoxSeparatorItem = class(TListBoxItem)
public
/// <summary>Gets default style for Group Header, which is used if TListBox.DefaultItemStyles.GroupHeaderStyle
/// is empty</summary>
function GetDefaultGroupHeaderStyle: string;
end;
TListBoxGroupHeader = class(TListBoxSeparatorItem)
strict private
[Weak] FCloneRef: TListBoxGroupHeader;
protected
function DoGetDefaultStyleLookupName(const Defaults: TListBoxItemStyleDefaults): string; override;
procedure DoTextChanged; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
/// <summary>Reference to sticky TListBoxGroupHeader clone in Plain grouping mode</summary>
property CloneRef: TListBoxGroupHeader read FCloneRef write FCloneRef;
end;
TListBoxGroupFooter = class(TListBoxSeparatorItem)
protected
function DoGetDefaultStyleLookupName(const Defaults: TListBoxItemStyleDefaults): string; override;
public
constructor Create(AOwner: TComponent); override;
end;
/// <summary>Base class for selection controllers. Selection controllers handle various types of selection.
/// Normally TListBox.MultiSelectStyle property selects one of the three predefined ones:
/// TSingleSelectionController, TMutiselectSelectionController, TExtendedSelectionController
/// </summary>
TListBoxSelector = class abstract
public type
/// <summary>Keyboard selection action: Move (arrow keys) or Toggle (space)</summary>
TKeyAction = (Move, Toggle);
strict protected
/// <summary>Reference to TListBox that hosts this controller</summary>
[Weak] FListBox: TCustomListBox;
/// <summary>Index of currently selected item, -1 if none</summary>
FCurrent: Integer;
/// <summary>Index of first selected item, -1 if none</summary>
FFirst: Integer;
/// <summary>Timer used for DelayedMouseDown</summary>
FSelectionTimer: TTimer;
/// <summary>Item that's going to be acted upon if DelayedMouseDown is employed</summary>
FSelectionTimerTarget: TListBoxItem;
/// <summary>Flag used to prevent sending change notification</summary>
FInternalChange: Boolean;
/// <summary>True during mouse selection</summary>
FMouseSelectActive: Boolean;
protected
/// <summary>Create a new instance of TSelectionController</summary>
constructor Create(const ListBox: TCustomListBox); virtual;
/// <summary>Getter for MutliSelectStyle</summary>
function GetMultiSelectStyle: TMultiSelectStyle; virtual; abstract;
/// <summary>Make host TListBox update selection visuals</summary>
procedure UpdateSelection;
/// <summary>Initiate a delayed mouse down action</summary>
procedure DelayedMouseDown(const ItemDown: TListBoxItem; const Shift: TShiftState);
/// <summary>Abort delayed mouse down action, if any</summary>
procedure AbortDelayed;
function GetMouseSelectActive: Boolean;
procedure SetMouseSelectActive(const Value: Boolean); virtual;
public
destructor Destroy; override;
/// <summary>Get first item index, -1 if none</summary>
function GetFirst: Integer;
/// <summary>Get current item index, -1 if none</summary>
function GetCurrent: Integer;
/// <summary>Get current TListBoxItem, nil if none selected</summary>
function GetCurrentItem: TListBoxItem;
/// <summary>Clear selection</summary>
procedure ClearSelection;
/// <summary>Attempt to copy selection from another selector</summary>
procedure CopySelection(const Other: TListBoxSelector); virtual; abstract;
/// <summary>Select everything</summary>
procedure SelectAll;
/// <summary>Select range between TListBoxItems Item1 and Item2</summary>
function SelectRange(const Item1, Item2: TListBoxItem): Boolean;
/// <summary>Mark TListBoxItem Item as Selected if Value is True, as not selected if Value is False.
/// No notification. Return true if Item.Selected has been changed.</summary>
function SetSelected(const Item: TListBoxItem; const Value: Boolean): Boolean;
/// <summary>Set item with index Index as current. Return True if the value of Current has been changed.</summary>
function SetCurrent(const Index: Integer): Boolean;
/// <summary>Used to notify this TSelectionController when item state was changed externally. See DoItemStateChanged.</summary>
procedure ItemStateChanged(const Item: TListBoxItem; const UserChange: Boolean);
/// <summary>Start mouse selection</summary>
procedure MouseSelectStart(const Item: TListBoxItem; const Button: TMouseButton; const Shift: TShiftState); virtual;
/// <summary>Handle mouse move during selection</summary>
procedure MouseSelectMove(const Item: TListBoxItem; const Shift: TShiftState); virtual;
/// <summary>Before mouse selection is finished</summary>
procedure MouseSelectFinishing(const Item: TListBoxItem; const Button: TMouseButton; const Shift: TShiftState); virtual;
/// <summary>Finish mouse selection</summary>
procedure MouseSelectFinish(const Item: TListBoxItem; const Button: TMouseButton; const Shift: TShiftState); virtual;
/// <summary>Select using keyboard, e.g. by pressing space. KeyAction is one of: Move or Toggle</summary>
procedure KeyboardSelect(const KeyAction: TKeyAction; const Shift: TShiftState; const Item: TListBoxItem); virtual;
/// <summary>Invoked when item index is set programmatically by user</summary>
procedure UserSetIndex(const Index: Integer); virtual;
/// <summary>Dispatch change notification</summary>
procedure Change;
/// <summary>MouseSelectStart implementation</summary>
procedure DoMouseSelectStart(const Item: TListBoxItem; const Shift: TShiftState); virtual; abstract;
/// <summary>MouseSelectMove implementation</summary>
procedure DoMouseSelectMove(const Item: TListBoxItem; const Shift: TShiftState); virtual; abstract;
/// <summary>MouseSelectFinishing implementation</summary>
procedure DoMouseSelectFinishing(const Item: TListBoxItem; const Shift: TShiftState); virtual;
/// <summary>MouseSelectFinish implementation</summary>
procedure DoMouseSelectFinish(const Item: TListBoxItem; const Shift: TShiftState); virtual; abstract;
/// <summary>KeyboardSelect implementation</summary>
procedure DoKeyboardSelect(const KeyAction: TKeyAction; const Shift: TShiftState; const Item: TListBoxItem); virtual; abstract;
/// <summary>UserSetIndex implementation</summary>
procedure DoUserSetIndex(const Index: Integer); virtual; abstract;
/// <summary>ItemStateChanged implementation</summary>
procedure DoItemStateChanged(const Item: TListBoxItem; const UserChange: Boolean); virtual;
/// <summary>MultiSelectStyle that this selection controller implements</summary>
property MultiSelectStyle: TMultiSelectStyle read GetMultiSelectStyle;
/// <summary>True during mouse selection</summary>
property MouseSelectActive: Boolean read GetMouseSelectActive write SetMouseSelectActive;
end;
TListBoxSelectorClass = class of TListBoxSelector;
/// <summary>A factory to create and register selectors based on multi-
/// selection styles.</summary>
TListBoxSelectorFactory = class
private
class var FSelectors: array[TMultiSelectStyle] of TListBoxSelectorClass;
public
/// <summary>Create TListBoxSelector for ListBox based on MultiSelectStyle</summary>
class function CreateSelector(const ListBox: TCustomListBox; const MultiSelectStyle: TMultiSelectStyle): TListBoxSelector;
/// <summary>Register a selector that handles given MultiSelectStyle. Used during framework initialization</summary>
class procedure RegisterSelector(MultiSelectStyle: TMultiSelectStyle; Selector: TListBoxSelectorClass);
end;
{ TComboListBox }
TComboListBox = class(TCustomListBox, IContent)
protected
[Weak] FComboBox: TCustomComboBox;
FInKeyDown: Boolean;
procedure KeyDown(var Key: Word; var KeyChar: System.WideChar; Shift: TShiftState); override;
function GetObservers: TObservers; override;
function GetDefaultStyleLookupName: string; override;
procedure IContent.Changed = ContentChanged;
procedure ContentChanged; virtual;
public
constructor Create(AOwner: TComponent); override;
procedure MouseMove(Shift: TShiftState; X, Y: Single); override;
procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Single); override;
end;
{ TCustomComboBox }
TCustomComboBox = class(TStyledControl, IItemsContainer, IGlyph)
private
FDropDownCount: Integer;
FDroppedDown: Boolean;
FIsPressed: Boolean;
FOldItemIndex: Integer;
FItemWidth: Single;
FOnChange: TNotifyEvent;
FOnClosePopup: TNotifyEvent;
FOnPopup: TNotifyEvent;
FImageLink: TGlyphImageLink;
FDropDownKind: TDropDownKind;
FPopup: TPopup;
FListBox: TComboListBox;
FItemIndex: Integer;
FListPicker: TCustomListPicker;
[Weak] FImages: TCustomImageList;
FItemsChanged: Boolean;
procedure SetItemIndex(const Value: Integer);
function GetItemIndex: Integer;
function GetCount: Integer;
procedure SetListBoxResource(const Value: string);
function GetListBoxResource: string;
function GetItemHeight: Single;
procedure SetItemHeight(const Value: Single);
procedure SetItemWidth(const Value: Single);
function GetPlacement: TPlacement;
function GetPlacementRectangle: TBounds;
procedure SetPlacement(const Value: TPlacement);
procedure SetPlacementRectangle(const Value: TBounds);
procedure UpdateCurrentItem;
function GetItems: TStrings;
function GetListItem(Index: Integer): TListBoxItem;
function GetSelected: TListBoxItem;
procedure SetItems(const Value: TStrings);
function GetImages: TCustomImageList;
procedure SetImages(const Value: TCustomImageList);
{ IGlyph }
function GetImageIndex: TImageIndex;
procedure SetImageIndex(const Value: TImageIndex);
function GetImageList: TBaseImageList; inline;
procedure SetImageList(const Value: TBaseImageList);
function IGlyph.GetImages = GetImageList;
procedure IGlyph.SetImages = SetImageList;
{ IItemContainer }
function GetItemsCount: Integer;
function GetItem(const AIndex: Integer): TFmxObject;
function UseNativePicker: Boolean;
function ItemsStored: Boolean;
procedure HandleStringsChanged(const S: string; const Op: TCustomListBox.TStringsChangeOp);
protected
procedure DefineProperties(Filer: TFiler); override;
procedure DoOnValueChangedFromDropDownList(Sender: TObject; const AValueIndex: Integer);
procedure DoChange; dynamic;
procedure DoPopup(Sender: TObject);
procedure DoClosePopup(Sender: TObject);
procedure DoClosePicker(Sender: TObject);
function CreateListBox: TComboListBox; virtual;
function CanObserve(const ID: Integer): Boolean; override;
procedure GetChildren(Proc: TGetChildProc; Root: TComponent); override;
function GetDefaultSize: TSizeF; override;
procedure ApplyStyle; override;
procedure DoRealign; override;
procedure DoContentPaint(Sender: TObject; Canvas: TCanvas; const ARect: TRectF); virtual;
procedure DoExit; override;
procedure DoAddObject(const AObject: TFmxObject); override;
procedure DoInsertObject(Index: Integer; const AObject: TFmxObject); override;
procedure DoRemoveObject(const AObject: TFmxObject); override;
procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Single); override;
procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X: Single; Y: Single); override;
procedure MouseWheel(Shift: TShiftState; WheelDelta: Integer; var Handled: Boolean); override;
procedure KeyDown(var Key: Word; var KeyChar: System.WideChar; Shift: TShiftState); override;
procedure Loaded; override;
/// <summary>Initialization of List Picker</summary>
procedure InitPicker(AListPicker: TCustomListPicker); virtual;
/// <summary>Recalculates popup size based on items</summary>
procedure RecalculatePopupSize; virtual;
/// <summary> Should be called when you change an instance or reference to instance of <b>TBaseImageList</b> or the
/// <b>ImageIndex</b> property
/// <para>See also <b>FMX.ActnList.IGlyph</b></para></summary>
procedure ImagesChanged; virtual;
property Popup: TPopup read FPopup;
property CanFocus default True;
property CanParentFocus;
property ItemHeight: Single read GetItemHeight write SetItemHeight;
property ItemWidth: Single read FItemWidth write SetItemWidth;
property DropDownCount: Integer read FDropDownCount write FDropDownCount default 8;
property Placement: TPlacement read GetPlacement write SetPlacement default TPlacement.Bottom;
property PlacementRectangle: TBounds read GetPlacementRectangle write SetPlacementRectangle;
property DropDownKind: TDropDownKind read FDropDownKind write FDropDownKind default TDropDownKind.Native;
property ListBoxResource: string read GetListBoxResource write SetListBoxResource;
property Picker: TCustomListPicker read FListPicker;
property OnChange: TNotifyEvent read FOnChange write FOnChange;
property OnClosePopup: TNotifyEvent read FOnClosePopup write FOnClosePopup;
property OnPopup: TNotifyEvent read FOnPopup write FOnPopup;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure SetNewScene(AScene: IScene); override;
procedure Clear; virtual;
procedure DropDown; virtual;
procedure Sort(Compare: TFmxObjectSortCompare); override;
property ListBox: TComboListBox read FListBox;
property Count: Integer read GetCount;
property Selected: TListBoxItem read GetSelected;
property Items: TStrings read GetItems write SetItems stored ItemsStored;
///<summary> The list of images. Can be <c>nil</c>. <para>See also <b>FMX.ActnList.IGlyph</b></para></summary>
property Images: TCustomImageList read GetImages write SetImages;
property ListItems[Index: Integer]: TListBoxItem read GetListItem;
property ItemIndex: Integer read GetItemIndex write SetItemIndex;
property DroppedDown: Boolean read FDroppedDown;
property IsPressed: Boolean read FIsPressed;
end;
{ TComboBox }
TComboBox = class(TCustomComboBox)
public
property PlacementRectangle;
published
property Align;
property Anchors;
property CanFocus;
property CanParentFocus;
property ClipChildren;
property ClipParent;
property Cursor;
property DisableFocusEffect;
property DragMode;
property DropDownCount;
property EnableDragHighlight;
property Enabled;
property Locked;
property Height;
property HelpContext;
property HelpKeyword;
property HelpType;
property Hint;
property HitTest;
property Items;
property Images;
property ItemIndex default -1;
property ItemWidth;
property ItemHeight;
property ListBoxResource;
property Padding;
property DropDownKind;
property Opacity;
property Margins;
property Placement;
property PopupMenu;
property Position;
property RotationAngle;
property RotationCenter;
property Scale;
property Size;
property StyleLookup;
property TabOrder;
property TabStop;
property TouchTargetExpansion;
property Visible;
property Width;
property ParentShowHint;
property ShowHint;
{events}
property OnApplyStyleLookup;
property OnChange;
property OnClosePopup;
property OnPopup;
{Drag and Drop events}
property OnDragEnter;
property OnDragLeave;
property OnDragOver;
property OnDragDrop;
property OnDragEnd;
{Keyboard events}
property OnKeyDown;
property OnKeyUp;
{Mouse events}
property OnCanFocus;
property OnClick;
property OnDblClick;
property OnEnter;
property OnExit;
property OnMouseDown;
property OnMouseMove;
property OnMouseUp;
property OnMouseWheel;
property OnMouseEnter;
property OnMouseLeave;
property OnPainting;
property OnPaint;
property OnResize;
property OnResized;
end;
TMetropolisUIListBoxItem = class(TListBoxItem)
private
FImage: TImage;
FText: TLayout;
FTextPanel: TPanel;
FTitle: TLabel;
FSubTitle: TLabel;
FDescription: TLabel;
FIconSize: Integer;
procedure SkipIconSize(Reader: TReader);
procedure SkipAlign(Reader: TReader);
protected
procedure SetIcon(const Bitmap: TBitmap); virtual;
function GetIcon : TBitmap; virtual;
procedure SetTitle(const Title: String); virtual;
function GetTitle: String; virtual;
procedure SetSubTitle(const SubTitle: String); virtual;
function GetSubTitle: String; virtual;
procedure SetDescription(const Description: String); virtual;
function GetDescription: String; virtual;
procedure SetIconSize(Value: Integer); virtual;
procedure SetParent(const AParent: TFmxObject); override;
procedure ApplyStyle; override;
procedure FreeStyle; override;
procedure OnBitmapChanged(Sender: TObject);
procedure Resize; override;
procedure DoRealign; override;
procedure DefineProperties(Filer: TFiler); override;
function GetDefaultStyleLookupName: string; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
property IconSize: Integer read FIconSize write SetIconSize;
published
property Title: String read GetTitle write SetTitle nodefault;
property SubTitle: String read GetSubTitle write SetSubTitle nodefault;
property Description: String read GetDescription write SetDescription nodefault;
property Icon: TBitmap read GetIcon write SetIcon;
property Padding;
property Margins;
end;
implementation
uses
{$IFDEF MACOS}Macapi.CoreFoundation, {$ENDIF} System.Character,
System.Math, System.Generics.Defaults, System.Math.Vectors, System.TypInfo, FMX.Consts, FMX.BehaviorManager,
FMX.Forms, FMX.Utils, FMX.Platform;
type