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Displaying items 391 to 405 of 886, page 27 of 60

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TAdvListView
Drag & drop

This component is functionally equivalent to a standard TListView.
Drag & drop is handled by either setting AdvListView.DragMode = dmManual and implement a BeginDrag from an OnMouseMove for example or set AdvListView.DragMode = dmAuto and handle OnDragStart and other drag & drop related events.

TAdvPanel
Moving and resizing panels at runtime

To move the panel, you'll need to set AdvPanel.CanMove = true and also set AdvPanel.Caption.Visible = true as moving is done by dragging the caption.
To re-size the panel, set AdvPanel.CanSize := true;

TAdvOfficeImage
How to autosize the component after loading a PNG file with AdvOfficeImage.Picture.LoadFromFile

Please use code similar to:

begin
  AdvOfficeImage1.Picture.LoadFromFile('c:\temp\weather.png');
  AdvOfficeImage1.Width := AdvOfficeImage1.Picture.Width;
  AdvOfficeImage1.Height := AdvOfficeImage1.Picture.Height;
end;

TAdvAlertWindow
Create descending class with custom TMsgCollectionItem classes

Starting from version 1.8, it is possible to create a descendent class of TAdvAlertWindow where it is possible to use a custom extended class of TMsgCollectionItem as AlertMessages collection. This code makes it clear how this can be done:

type
  TMsgCollectionItemEx = class(TMsgCollectionItem)
  private
    FExtra: string;
  published
    property Extra: string read FExtra write FExtra;
  end;

  TMsgCollectionEx = class(TMsgCollection)
  protected
    function GetItemClass: TCollectionItemClass; override;
  end;

  TAdvAlertWindowEx = class(TAdvAlertWindow)
  protected
    function CreateMsgCollection: TMsgCollection; override;
  end;

implementation

{ TMsgCollectionEx }

function TMsgCollectionEx.GetItemClass: TCollectionItemClass;
begin
  Result := TMsgCollectionItemEx;
end;

{ TAdvAlertWindowEx }

function TAdvAlertWindowEx.CreateMsgCollection: TMsgCollection;
begin
  Result := TMsgCollectionEx.Create(Self);
end;

TMS FMX UI Pack
Compiling / Distribution for iOS

When creating your project in Delphi, and afterwards, generate a xcode compatible project (dpr2xcode.exe) there are some additional steps to be taken before the project will compile in xcode.

In the generated iOS version you will notice an xcode folder, with an xcode project file. Before opening this project file in xcode you need to copy the correct source files from the installation directory to the directory of this your xcode project:

- All the FMX_*.pas files
- All the FMX_*.res files
- The tmsdefsios.inc file

The last step to take is to rename the tmsdefsios.inc file to tmsdefs.inc file in order to compile correctly. After opening the project in xcode, click the run button, which will automatically compile and run the project in the simulator. Of course you can select to run it on a real device as well.

TMS FMX UI Pack
My First FireMonkey Component

Below is a sample that is useful to understand the design of a new FireMonkey component. These three code snippets will result in your first control which has a backgroundrectangle, a button, an edit, and an additional rectangle.

This component only loads the style file as a layout, and is static. You can click on the button and type in the edit field, but the component has no properties to interact with.

fmx.MyFirstControl.pas

unit fmx.MyFirstControl;

interface

uses
  FMX.Types, Types, Classes;

  TMyFirstControl = class(TStyledControl)
  private
  public
    constructor Create(AOwner: TComponent); override;
  protected
    function GetClassName: String; virtual;
    function GetClassStyleName: String; virtual;
    function GetStyleObject: TControl; override;
    function LoadFromResource: TControl;
  end;

procedure Register;

implementation

{$R fmx.myfirstcontrol.res}

procedure Register;
begin
  RegisterComponents(‘My First FireMonkey Control’, [TMyFirstControl]);
end;

function TMyFirstControl.GetClassName: String;
begin
  Result := ClassName;
end;

constructor TMyFirstControl.Create(AOwner: TComponent); override;
begin
  inherited;
  Width := 209;
  Height := 105;
end;

function TMyFirstControl.GetClassStyleName: String;
begin
  Result := GetClassName + 'style';
  Delete(Result, 1, 1);
end;
 
function TMyFirstControl.GetStyleObject: TControl;
var
  obj: TControl;
begin
  obj := inherited GetStyleObject;

  if not Assigned(obj) then
  begin
    // not found in default or custom style book, so create from resource
    obj := LoadFromResource;
  end;

  Result := obj;
end;

function TMyFirstControl.LoadFromResource: TControl;
var
  S: TResourceStream;
  str: String;
begin
  Result := nil;
  // create resource class name
  str := GetClassStyleName;
  if FindRCData(HInstance, str) then
  begin
    // load from RT_RCDATA resource type
    S := TResourceStream.Create(HInstance, str, RT_RCDATA);
    try
      Result := TControl(CreateObjectFromStream(nil, S));
    finally
      S.Free;
    end;
  end;
end;

initialization
  RegisterFmxClasses([TMyFirstControl]);
end.

fmx.myfirstcontrol.style

  object TRectangle
    StyleName = 'MyFirstControlStyle'
    Position.Point = '(184,248)'
    Width = 209.000000000000000000
    Height = 105.000000000000000000
    Fill.Kind = bkNone
    Stroke.Kind = bkNone
    object TRectangle
      StyleName = 'background'
      Align = alClient
      Width = 209.000000000000000000
      Height = 105.000000000000000000
      object TButton
        StyleName = 'Button1'
        Position.Point = '(10,20)'
        Width = 80.000000000000000000
        Height = 22.000000000000000000
        TabOrder = 0
        Text = 'Button1'
      end
      object TEdit
        StyleName = 'Edit1'
        Position.Point = '(102,20)'
        Width = 100.000000000000000000
        Height = 22.000000000000000000
        TabOrder = 1
        KeyboardType = vktDefault
        Password = False
      end
      object TRectangle
        StyleName = 'rectangleElement'
        Position.Point = '(11,48)'
        Width = 65.000000000000000000
        Height = 49.000000000000000000
        Fill.Color = xFFFF4B4B
      end
    end
  end

fmx.myfirstcontrol.rc

MyFirstControlStyle RCDATA "fmx.myfirstcontrol.style"

Let’s say you want to rotate the rectangle through a property. Create a property that will control the RotationAngle of the rectangle. In the setter you can access the rectangle with his StyleName:

rt := (FindStyleResource(‘rectangleElement’) as TRectangle);
rt.RotationAngle := MyRotationAngleProperty; //sample below 45°

TMS FMX UI Pack
FireMonkey Guidelines

More information on developing FireMonkey components and building / deploying on other platforms can be found on http://docwiki.embarcadero.com/RADStudio/en/FireMonkey_Components_Guide

TMS FMX UI Pack
Updating the FireMonkey controls at runtime

To increase the performance, and to make sure all properties functions methods are executed and set, encapsulate every runtime update with a BeginUpdate and EndUpdate call.

var  
  i: integer;  
begin  
   TMSFMXTableView1.BeginUpdate;  
   for i := 0 to 1000  do  
   begin  
     TMSFMXTableView1.Items.Add.Caption := 'item '+ inttostr(i);  
   end;  
   TMSFMXTableView1.EndUpdate;  
end;

var  
  i: integer;  
begin  
   TMSFMXGrid1.BeginUpdate;  
   TMSFMXGrid1.ColumnWidths[2] := 100;
   TMSFMXGrid1.EndUpdate;  
end;

TAdvSmoothPageSlider
How to create a new page at runtime

To create a new page at runtime the following code can be used:

var
  sp: TAdvSmoothPage;
begin
  sp:= TAdvSmoothPage.Create(AdvSmoothPageSlider1);
  sp.PageSlider := AdvSmoothPageSlider1;
  sp.Header := 'Runtime created page';
end;

To remove a page at runtime, simply destroy the page:

AdvSmoothPage.Free;

TMS ToolPanels
How to know if a panel is Rolled In or Rolled Out

You can retrieve this via
AdvToolPanelTab.Panels[index].State = psOpened

TDBAdvGrid
General tips

For optimum performance, grid.PageMode should be set to true. Depending on the TDataSet used, it might further improve performance to implement the OnGetRecordCount event.

The grid supports internal sorting, filtering, grouping, lookupbar as opposed to sorting, filtering, grouping performed on dataset level. When it is preferred to use the grids internal implementation as opposed to the dataset level implementation, set grid.PageMode = false.

Features like disjunct row selection, rearranging data (with goRowMoving = true in grid.Options or via drag & drop) also require that grid.PageMode = false

TMS TableView for FireMonkey
Updating the tableview

Updating the list will be done whenever an item is added but to increase the performance, encapsulate every list update with a BeginUpdate and EndUpdate call.

var  
  i: integer;  
begin  
   TMSFMXTableView1.BeginUpdate;  
   for i := 0 to 1000  do  
   begin  
     TMSFMXTableView1.Items.Add.Caption := 'item '+ inttostr(i);  
   end;  
   TMSFMXTableView1.EndUpdate;  
end;

TDBAdvGrid
The scrollbar is only limited to three positions

This behavior is caused by the dataset. When grid.PageMode = true and DataSetType = dtNonSequenced the grid only displays a buffer of visible records, the grid has no information at all where this buffer is positioned in the database except that it is the first buffer, last buffer or not the first or last buffer. Hence, there are only 3 possible scrollbar positions.

When you set grid.PageMode = false, the grid loads & shows all records and can thus show an exact scrollbar position.

How to use TVAcomm.ReadBuf

ReadBuf() is a function used to read in one time a buffer of data of a specific size from the serial port.

Example code snippet:

var
  buf: array[0..255] of byte;
begin
  if vacomm1.ReadBufUsed >= 256 then
    vacomm1.ReadBuf(buf,256);
end;

This first checks whether vaComm has minimum 256 bytes of data received and will then read it with one call.

TDBAdvGrid
How to change a row or cell color depending on a value in the database

Please see the demo ADOSelColor in the TDBAdvGrid samples distribution, this shows how to dynamically set a color on cells depending on DB values.

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