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Displaying items 286 to 300 of 508, page 20 of 34

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THTMLCheckList
How to make the THTMLCheckList only let one check box marked at a time

You can easily have a radiobutton-like behavior in THTMLCheckList by adding the following event handler for OnCheckClick:

procedure TForm5.HTMLCheckList1CheckClick(Sender: TObject; Index: Integer); 
begin
  HTMLCheckList1.UnCheckAll;
  HTMLCheckList1.Checked[Index] := true; 
end;
	

TAdvStringGrid
How to handle the event of changing the combobox from the TColumnComboEditLink component in a TAdvStringGrid

Following code with a TAdvStringGrid and a TColumnComboEditLink on the form demonstrates how you can handle the ComboChange event:

procedure TForm1.AdvStringGrid1GetEditorProp(Sender: TObject; ACol,
  ARow: Integer; AEditLink: TEditLink);
begin
  ColumnComboEditLink1.Combo.OnChange := ComboChange;
end;

procedure TForm1.AdvStringGrid1GetEditorType(Sender: TObject; ACol,
  ARow: Integer; var AEditor: TEditorType);
begin
  AEditor := edCustom;
  AdvStringGrid1.EditLink :=ColumnComboEditLink1;
end;

procedure TForm1.ComboChange(Sender: TObject);
var
  cc: TColumnComboBox;
begin
  cc := Sender as TColumnComboBox;
  advstringgrid1.Cells[0,0] := inttostr(cc.ItemIndex) + ':'+ cc.ComboItems.Items[cc.ItemIndex].Strings[0];
end;
	

TAdvStringGrid
How to initialize the TAdvGridHeaderList with hidden columns

To allow an easy customization of what columns to show in a grid by the user, an often used user interface is a list holding the available columns and allowing the user to drag & drop from the grid the columns that should be hidden or drag columns that should be displayed from the list to the grid. To achieve this functionality, a component is offered that integrate much of this functionality: TAdvGridHeaderList. The TAdvGridHeaderList is a listbox-style control that holds indexes of available (hidden) columns. By means of drag & drop from the column header to the list and vice versa, it is possible to define what columns to show or not show in the grid.

Here you can download a demo that shows how you can initialize a TAdvGridHeaderList with hidden columns

TAdvStringGrid
How to programmatically set focus to the search box in the grid search footer

You can do this with:

grid.SearchPanel.EditControl.SetFocus;

TWebUpdate
How to update files inside a subfolder under the application folder

If you deployed under C:\Program Files (x86)\ there is no other choice than deploying this as application components (i.e. files should be in CAB and CAB should be listed under appcomps=... in the WebUpdate .INF control file) as typically, your installed app isn’t running with admin permissions to be able to write under the protected \Program Files folder.

TMS iCL
How to verify if TouchID is available on the device

As soon as you add the LocalAuthentication component, you are bound to iOS 8.0. The component already internally checks if authentication is possible before executing it. There is currently no separate verification but if you want to verify if TouchID is available you can use the following code (it requires the FMX.TMSNativeUICore unit)

function TForm1.TouchIDAvailable: Boolean;
var
  ctx: LAContext;
  error: PPointer;
  auth: NativeInt;
begin
  result := False;
  ctx := TLAContext.Wrap(TLAContext.Wrap(TLAContext.OCClass.alloc).init);
  error := nil;
  auth := LAPolicyDeviceOwnerAuthenticationWithBiometrics;
  if ctx.canEvaluatePolicy(auth, error) then
    Result := True;
  ctx.release;
end;

TMS FMX Cloud Pack
When connecting to FaceBook, I get an error similar to: "The URL entered is not permitted by the application configuration."

Please make sure the “Embedded browser OAuth login” is enabled in your app:

Go to: https://developers.facebook.com/apps
Select your app from the Apps dropdown.
Click on the “Settings” section
Click on the “Advanced” tab
Make sure the “Embedded browser OAuth login” switch is set to “YES”
Save changes

TMS FMX Chart
How to add animation when series are added

The TMS Chart for FireMonkey includes a simple animation mode to animate the series from 0 values to the values that are added or vice versa. The AnimationFactor and AnimationFlow properties on Series level determine the speed and mode. There are 2 events that can be used to trace progress: OnAnimateSerieStarted and OnAnimateSerieFinished.

Here you can download a demo that adds animation and triggers it from a button click. Clicking a second time reverts the bars back to zero.

TTreeList
Showing images in Treelist

To add images to the treelist, please first add a column to the TTreeList where you set TreeList.Columns[index].Image = true

The image displayed in the column for which property Image = true will then be displayed based on the imageindex set for the node.

Note that this way, only one image can be set per node, but with the Columns[index].Image you can choose in what column to set it. If you want to set different images in different columns, I’d recommend to use THTMLTreeList that is basically the same as TTreeList but allows to insert images via HTML tags (<IMG src=”idx:0”>) in text in any column and this way, you could set different images in different columns.

TTreeList
Programmatically adding items with column values

You use the separator between values of different columns, i.e.:

var
  tn: TTreeNode;
begin
  tn.Text := ''Column 1 value''+TreeList1.Separator+''Column 2 Value'' ....
end;

TAdvRichEditor
How to copy contents from one TAdvRichEditor instance to another

Copying contents from one TAdvRichEditor instance to another can be done in following way:

var
  ms: TMemoryStream;

begin
  ms := TMemoryStream.Create;

  try
    AdvRichEditor1.SaveToStream(ms);
    ms.Position := 0;
    AdvRichEditor2.LoadFromStream(ms);
  finally
    ms.Free;
  end;
end;

TTreeList
How to set the background color per item

To set the background color per item, implement OnCustomDrawItem and set the Canvas.Brush.Color from this event.

This example code snippet applies color banding to TTreeList:

procedure TForm1.TreeList1CustomDrawItem(Sender: TCustomTreeView;
  Node: TTreeNode; State: TCustomDrawState; var DefaultDraw: Boolean); 
begin
  if odd(Node.Index) then
    TreeList1.Canvas.Brush.Color := clInfoBk
  else
    TreeList1.Canvas.Brush.Color := clWindow; 
end;

TAdvSpreadGrid
How to add formula support in TAdvSpreadGrid to access DB tables

With this small DB sample mathlib, the concept is demonstrated to add formula support in TAdvSpreadGrid to access DB tables:

type

  TDBMathLib = class(TMathLib)
  private
    { Private declarations }
    FDataSource: TDataSource;
  protected
    { Protected declarations }
    procedure Notification(AComponent: TComponent; AOperation: TOperation); override;
  public
    { Public declarations }
    function HandlesStrFunction(FuncName:string):Boolean; override;
    function CalcStrFunction(FuncName:string;Params:TStringList;var ErrType,ErrParam: Integer):string; override;
  published
    { Published declarations }
    property DataSource: TDataSource read FDataSource write FDataSource;
  end;


implementation

{ TDBMathLib }

function TDBMathLib.CalcStrFunction(FuncName: string; Params: TStringList;
  var ErrType, ErrParam: Integer): string;
var
  s: string;
  n,e: integer;
  fld: TField;
begin
  if (FuncName = ''DBV'') then
  begin
    if Params.Count <> 2 then
    begin
      ErrType := Error_InvalidNrOfParams;
      Exit;
    end;

    if not Assigned(DataSource) then
    begin
      ErrType := Error_NoDataSource;
      Exit;
    end;

    if not Assigned(DataSource.DataSet) then
    begin
      ErrType := Error_NoDataSet;
      Exit;
    end;

    if not DataSource.DataSet.Active then
    begin
      ErrType := Error_NoDataSetActive;
      Exit;
    end;

    s := Params.Strings[0]; // DB FIELD value

    fld := DataSource.DataSet.FieldByName(s);

    if not Assigned(fld) then
    begin
      ErrType := Error_InvalidValue;
      ErrParam := 1;
    end
    else
    begin
      val(Params.Strings[1],n, e);

      DataSource.DataSet.First;
      DataSource.DataSet.MoveBy(n);

      Result := fld.AsString;
    end;
  end;
end;

function TDBMathLib.HandlesStrFunction(FuncName: string): Boolean;
begin
  Result := FuncName = ''DBV'';
end;

procedure TDBMathLib.Notification(AComponent: TComponent;
  AOperation: TOperation);
begin
  inherited;
  if (AOperation = opRemove) and (AComponent = FDataSource) then
    FDataSource := nil;
end;

TMS FMX UI Pack
TTMSFMXProgressBar: How to change the color of the progressbar

The TTMSFMXProgressBar inherits from TProgressBar so you can style identical to TProgressBar. You can either change the hindicator or vindicator TRectangle (based on the orientation) in the stylebook, or programmatically In the OnApplyStyleLookup event.

Example:

procedure TForm1.FormCreate(Sender: TObject);
begin
  TMSFMXProgressBar1.Value := 75;
end;

procedure TForm1.TMSFMXProgressBar1ApplyStyleLookup(Sender: TObject);
var
  r: TRectangle;
begin
  r := TMSFMXProgressBar1.FindStyleResource(''hindicator'') as TRectangle;
  r.Fill.Color := claRed;
  r.Fill.Kind := TBrushKind.Solid;
end;

TMS FMX UI Pack
TTMSFMXEditBtn: How to show a combox with TTMSFMXEditBtn linked to a TFDQuery dataset

You need to link the Text value as you would with a normal TEdit. You can then add a TListBox as dropdown control which is linked to the field of choice. This should work with any control (TListView, TGrid, ...).

Here you can download a sample that demonstrates this.

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