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unit FMX.Edit.Autocomplete;
interface
uses
FMX.Edit.Style, FMX.Controls.Presentation, FMX.Controls.Model, FMX.Presentation.Messages,
FMX.Controls, FMX.ListBox, System.Classes, System.Types, FMX.Presentation.Style, FMX.Objects, FMX.Edit, FMX.Forms;
type
TProc = procedure of object;
TStyledAutocompleteEdit = class(TStyledEdit)
private
FSuggestions: TArray<string>;
FPopup: TPopup;
FListBox: TListBox;
FDropDownCount: Integer;
FItemIndex: Integer;
FProc: TProc;
FClearButton: TClearEditButton;
protected
procedure MMDataChanged(var AMessage: TDispatchMessageWithValue<TDataRecord>); message MM_DATA_CHANGED;
procedure PMSetSize(var AMessage: TDispatchMessageWithValue<TSizeF>); message PM_SET_SIZE;
procedure DoChangeTracking; override;
procedure RebuildSuggestionList;
procedure RecalculatePopupHeight;
procedure KeyDown(var Key: Word; var KeyChar: Char; Shift: TShiftState); override;
procedure ListBoxItemClick(const Sender: TCustomListBox; const Item: TListBoxItem);
procedure DoExit; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
function ItemIndex: Integer;
procedure Select(const AText: string);
procedure SetOnSelect(AProc: TProc);
end;
TStyledAutocompleteEditProxy = class(TStyledPresentationProxy<TStyledAutocompleteEdit>);
implementation
uses
FMX.Presentation.Factory, FMX.Types, System.SysUtils, System.Math, System.UITypes, System.StrUtils,
FMX.Dialogs;
{ TStyledAutocompleteEdit }
constructor TStyledAutocompleteEdit.Create(AOwner: TComponent);
begin
inherited;
FPopup := TPopup.Create(nil);
FPopup.Parent := Self;
FPopup.PlacementTarget := Self;
FPopup.Placement := TPlacement.Bottom;
FPopup.Width := Width;
FListBox := TListBox.Create(nil);
FListBox.Parent := FPopup;
FListBox.Align := TAlignLayout.Client;
FListBox.OnItemClick := ListBoxItemClick;
FDropDownCount := 5;
FItemIndex := -1;
FProc := nil;
end;
destructor TStyledAutocompleteEdit.Destroy;
begin
FPopup := nil;
FListBox := nil;
FClearButton := nil;
inherited;
end;
procedure TStyledAutocompleteEdit.DoChangeTracking;
function HasSuggestion: Boolean;
var
I: Integer;
begin
I := 0;
Result := False;
while not Result and (I < Length(FSuggestions)) do
begin
Result := ContainsText(FSuggestions[I], Model.Text);
if not Result then
Inc(I)
else
Exit(Result);
end;
end;
function IndexOfSuggestion: Integer;
var
Found: Boolean;
I: Integer;
begin
Found := False;
I := 0;
Result := -1;
while not Found and (I < FListBox.Count) do
begin
Found := ContainsText(FListBox.Items[I], Model.Text);
if not Found then
Inc(I)
else
Exit(I);
end;
end;
begin
inherited;
FItemIndex := -1;
if HasSuggestion then
begin
RebuildSuggestionList;
RecalculatePopupHeight;
Index := IndexOfSuggestion;
if Model.Text.IsEmpty then
FListBox.ItemIndex := -1
else
FListBox.ItemIndex := Index;
FPopup.IsOpen := True;
end
else
FPopup.IsOpen := False;
if Model.Text = '' then
FProc;
end;
procedure TStyledAutocompleteEdit.DoExit;
begin
inherited;
if (FItemIndex < 0) and (Text <> '') then
Text := '';
end;
function TStyledAutocompleteEdit.ItemIndex: Integer;
begin
Result := FItemIndex;
end;
procedure TStyledAutocompleteEdit.KeyDown(var Key: Word; var KeyChar: Char; Shift: TShiftState);
begin
inherited;
case Key of
vkReturn:
if FListBox.Selected <> nil then
begin
Model.Text := FListBox.Selected.Text;
Edit.GoToTextBegin;
FPopup.IsOpen := False;
end;
vkEscape:
FPopup.IsOpen := False;
vkDown:
if FListBox.Selected <> nil then
FListBox.ItemIndex := Min(FListBox.Count - 1, FListBox.ItemIndex + 1);
vkUp:
if FListBox.Selected <> nil then
FListBox.ItemIndex := Max(0, FListBox.ItemIndex - 1);
end;
end;
procedure TStyledAutocompleteEdit.ListBoxItemClick(const Sender: TCustomListBox; const Item: TListBoxItem);
var
I: Integer;
Word: string;
bFound: Boolean;
begin
Model.Text := Item.Text;
Edit.GoToTextBegin;
FPopup.IsOpen := False;
bFound := False;
I := -1;
for Word in FSuggestions do
begin
Inc(I);
if Model.Text = Word then
begin
bFound := True;
Break;
end;
end;
if bFound then
FItemIndex := I
else
FItemIndex := -1;
if Assigned(FProc) then
FProc;
end;
procedure TStyledAutocompleteEdit.MMDataChanged(var AMessage: TDispatchMessageWithValue<TDataRecord>);
var
Data: TDataRecord;
begin
Data := AMessage.Value;
if Data.Value.IsType < TArray<string>> and (Data.Key = 'suggestion_list') then
FSuggestions := AMessage.Value.Value.AsType<TArray<string>>;
end;
procedure TStyledAutocompleteEdit.PMSetSize(var AMessage: TDispatchMessageWithValue<TSizeF>);
begin
inherited;
FPopup.Width := Width;
end;
procedure TStyledAutocompleteEdit.RebuildSuggestionList;
var
Word: string;
begin
FListBox.Clear;
FListBox.BeginUpdate;
try
for Word in FSuggestions do
if ContainsText(Word, Model.Text) then
FListBox.Items.Add(Word);
finally
FListBox.EndUpdate;
end;
end;
procedure TStyledAutocompleteEdit.RecalculatePopupHeight;
begin
if FListBox.Items.Count > 0 then
begin
FPopup.Height := FListBox.ListItems[0].Height * Min(FDropDownCount, FListBox.Items.Count) + FListBox.BorderHeight;
FPopup.PopupFormSize := TSizeF.Create(FPopup.Width, FPopup.Height);
end;
end;
procedure TStyledAutocompleteEdit.Select(const AText: string);
var
Word: string;
I: Integer;
bFound: Boolean;
begin
I := -1;
bFound := False;
for Word in FSuggestions do
begin
Inc(I);
if Word = AText then
begin
Text := AText;
FPopup.IsOpen := False;
bFound := True;
Break;
end;
end;
if bFound then
FItemIndex := I
else
begin
FItemIndex := -1;
Text := '';
end;
if Assigned(FProc) then
FProc;
end;
procedure TStyledAutocompleteEdit.SetOnSelect(AProc: TProc);
begin
FProc := AProc;
end;
initialization
TPresentationProxyFactory.Current.Register('AutocompleteEdit-style', TStyledAutocompleteEditProxy);
finalization
TPresentationProxyFactory.Current.Unregister('AutocompleteEdit-style', TStyledAutocompleteEditProxy);
end. |