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Displaying items 211 to 225 of 508, page 15 of 34

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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
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.

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

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

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;

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;

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;

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.

TAdvSysKeyBoardHook
How to disable a key

To disable a key, handle AdvSysKeyboardHook and set Allow parameter = false for key you want to display

TPlanner
MultiDay Events in TPlanner and TDBPlanner

Multiday items will (by design - like in Outlook) be displayed in the header for each day where the event occurs.

You can do this by setting the property PlannerItem.InHeader :=true.
This means that for a non databound planner, you should add an inheader item for each day where the event occurs. In the TPlanner this can't happen automatically as there is no imposed fixed relationship between positions (columns) and days or resources you use.
Please make sure to increase Planner.header.Height so items can be shown there.

For the DB-aware TDBPlanner, this is handled automatically. TDBPlanner will display the items that span multiple days in the header for each day where the item occurs. It will display this as an item in the header on each day. It can indicate in the caption (when you set PlannerItem.CaptionType = ctTime) the start/end time of the item.

TDBPlanner
MultiDay Events in TPlanner and TDBPlanner

Multiday items will (by design - like in Outlook) be displayed in the header for each day where the event occurs.

You can do this by setting the property PlannerItem.InHeader :=true.
This means that for a non databound planner, you should add an inheader item for each day where the event occurs. In the TPlanner this can’t happen automatically as there is no imposed fixed relationship between positions (columns) and days or resources you use.
Please make sure to increase Planner.header.Height so items can be shown there.

For the DB-aware TDBPlanner, this is handled automatically. TDBPlanner will display the items that span multiple days in the header for each day where the item occurs. It will display this as an item in the header on each day. It can indicate in the caption (when you set PlannerItem.CaptionType = ctTime) the start/end time of the item.

TAdvStringGrid
How to set hints on images in the grid

A possible way to do this is:

begin
  advstringgrid1.GridImages := ImageList1;
  advstringgrid1.ShowHint := true;
  advstringgrid1.AnchorHint := true;
  advstringgrid1.Cells[1,1] := '';
end;

TAdvStringGrid
How to change the margin between the cell border and the text

You can control the text offset from top/left corner with the property:

AdvStringGrid.XYOffset

Default, the offset is applied both left and right, to apply the offset only left of the cell, set

AdvStringGrid.XYOffsetTopLeftOnly := true;

This applies to all cells. For example:

AdvStringGrid.XYOffset := point(0,0);

Results in:

AdvStringGrid.XYOffset := point(6,0);

Results in:

TAdvSmoothListBox
How to delete a single selected item

You can remove the selected item with:

AdvSmoothListBox1.Items.BeginUpdate;
AdvSmoothListBox1.Items[AdvSmoothListBox1.SelectedItemIndex].Free;
AdvSmoothListBox1.Items.EndUpdate

TAdvSmoothImageListBox
How to delete an item

AdvSmoothImageListBox1.Items.BeginUpdate;
AdvSmoothImageListBox1.Items[0].Free;
AdvSmoothImageListBox1.Items.EndUpdate;

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