How to add custom control?

thinkdif

Hi,
I write a custom control MyTextObject inherited from TextObject, it does nothing only inherited base behavior,
then i register it. in designer, i drag and drop MyTextObject, set expression, like Text = "[MyTable.MyField]" , and preview, it's ok, everything is well.

But if i drag and drop another TextObject, and set it's Text an error expression, like Text = "[errortest]". when i preview, error message will display a namespace error in MyTextObject not in TextObject which is true error.

If i add my assembly in script's ReferenceAssemblies, error message will display correctly, but i have to add my assembly in every report.
Do you have a good idea?

thanks.

my code like following:

namespace MySoft.Report
{
public class MyTextObject: TextObject
{
}
}

//init
RegisteredObjects.Add(typeof(MyTextObject), "ReportPage", null, "MyText");

thinkdif

I also found a new problem associate with this, i add my assembly in script's ReferenceAssemblies,
But if any expression in TextObject is error, I found my assembly in ReferenceAssemblies will be lost.

AlexTZ

thinkdif wrote: »

If i add my assembly in script's ReferenceAssemblies, error message will display correctly, but i have to add my assembly in every report.
Do you have a good idea?

If you have custom control, you have to add its assembly in every report that uses your control. I will try to simplify that in further builds.

mutlutan

How to add custom control?
help me!

AlexTZ

Please provide more info...

mutlutan

thanks,
my code:
public class MyButton : Button
{
public MyButton()
{
new Button();
//this.Name= "button1";
}
}

private void button1_Click(object sender, EventArgs e)
{
Bitmap bmp = (Bitmap)Bitmap.FromFile("C:\\alias.ico");
FastReport.Utils.RegisteredObjects.Add(typeof(MyButton), "DialogPage", bmp, "Mybuttontext");
report1.Design();
}

insert MyButton click on dialog form.
problem: "NullReferenceException".
Sorry bad english.

AlexTZ

It's very difficult to describe every aspect of creation of own control. The best way is to see how standard controls are implemented (yes, you need FR.Net Pro with sources to do this). Here is a code of the standard LabelControl:

  /// <summary>
  /// Represents a standard Windows label.
  /// Wraps the <see cref="System.Windows.Forms.Label"/> control.
  /// </summary>
  public class LabelControl : DialogControl
  {
    private Label FLabel;

    #region Properties
    /// <summary>
    /// Gets an internal [b]Label[/b].
    /// </summary>
    [Browsable(false)]
    public Label Label
    {
      get { return FLabel; }
    }

    /// <summary>
    /// Gets or sets a value indicating whether the control is automatically resized to display its entire contents.
    /// Wraps the <see cref="System.Windows.Forms.Label.AutoSize"/> property.
    /// </summary>
    [DefaultValue(true)]
    [Category("Layout")]
    public bool AutoSize
    {
      get { return Label.AutoSize; }
      set { Label.AutoSize = value; }
    }

    /// <summary>
    /// Gets or sets the alignment of text in the label.
    /// Wraps the <see cref="System.Windows.Forms.Label.TextAlign"/> property.
    /// </summary>
    [DefaultValue(ContentAlignment.TopLeft)]
    [Category("Appearance")]
    public ContentAlignment TextAlign
    {
      get { return Label.TextAlign; }
      set { Label.TextAlign = value; }
    }
    #endregion

    #region Public Methods
    /// <inheritdoc/>
    public override void Serialize(FRWriter writer)
    {
      LabelControl c = writer.DiffObject as LabelControl;
      base.Serialize(writer);

      if (AutoSize != c.AutoSize)
        writer.WriteBool("AutoSize", AutoSize);
      if (TextAlign != c.TextAlign)
        writer.WriteValue("TextAlign", TextAlign);
    }
    #endregion

    /// <summary>
    /// Initializes a new instance of the [b]LabelControl[/b] class with default settings. 
    /// </summary>
    public LabelControl()
    {
      FLabel = new Label();
      Control = FLabel;
      
      Label.AutoSize = true;
    }
  }

mutlutan

my aim is adding a component like "lookupcombobox" in delphi which supports name and value pairs ,i.e which can get data from two fields to its name and value properties, then select using the name property and get the value field.

Do you think adding it in later versions , or any ideas how can i achieve this ?

thanks.

AlexTZ

Maybe you will find the "data filtering" feature useful. Read about it in the user's manual ("Dialogue forms" chapter).

mutlutan

my aim is adding a component like "lookupcombobox" in delphi which supports name and value pairs ,i.e which can get data from two fields to its name and value properties, then select using the name property and get the value field.
Do you think adding it in later versions , or any ideas how can i achieve this ?

i'll use lookupcombo to construct an sql string

AlexTZ

No, I'm not going to add this. You can use standard combobox control and write all necessary logic using the script.

mutlutan

combobox control "valueMamber" property not found!

AlexTZ

See the User's manual, "Dialogue forms/Referencing to a control from code":


In fact, the FastReport's control is just a wrapper for the standard .Net control. It wraps many, but not all, properties of the standard control. If you need some property that is not implemented by the FastReport control, you may access a wrapped standard control in the following way:

?· using the "Control" property, which is of System.Windows.Forms.Control type:

(TextBox1.Control as TextBox).ShortcutsEnabled = false;

?· using the property which has the same name as the control itself, but without the "Control" suffix. For example, the TextBoxControl has got the "TextBox" property, which is of System.Windows.Forms.TextBox type and returns the wrapped TextBox control:

TextBox1.TextBox.ShortcutsEnabled = false;

Help on properties and methods of the controls can be accessed from the MSDN.

mutlutan

[img]style_emoticons/<#EMO_DIR#>/rolleyes.gif" style="vertical-align:middle" emoid=":rolleyes:" border="0" alt="rolleyes.gif" /> Thanks. best regard[/img]