TrackBarView_t::DrawChannel

This method draws the trackbar channel.

static void DrawChannel(
  HDC hdc,
  DWORD style,
  BOOL bSelection,
  LONG lSelStart,
  LONG lSelEnd,
  LONG lLogMin,
  LONG lLogMax,
  LONG iSizePhys,
  int left,
  LPRECT lprc
);

Parameters

• hdc
  [in] Handle to the device context for the window.
• style
  [in] DWORD that specifies the style of the trackbar. The following table shows the possible values.

  Trackbar control styles	Description
  TBS_AUTOTICKS	The trackbar has a tick mark for each increment in its range of values.
  TBS_BOTH	The trackbar displays tick marks on both sides of the control. These sides are both top and bottom when used with TBS_HORZ or both left and right when used with TBS_VERT.
  TBS_BOTTOM	The trackbar displays tick marks below the control. This style is only valid with TBS_HORZ.
  TBS_ENABLESELRANGE	The trackbar displays a selection range only. The tick marks at the starting and ending positions of a selection range are displayed as triangles instead of vertical dashes and the selection range is highlighted.
  TBS_FIXEDLENGTH	The trackbar control allows the size of the slider to be changed with the TBM_SETTHUMBLENGTH message.
  TBS_HORZ	The trackbar is oriented vertically. This orientation is the default orientation.
  TBS_LEFT	The trackbar displays tick marks to the left of the control. This style is only valid with TBS_VERT.
  TBS_NOTHUMB	The trackbar does not display a slider.
  TBS_NOTICKS	The trackbar does not display any tick marks.
  TBS_REVERSED	The trackbar is reversed, so that a smaller number indicates higher and a larger number indicates lower.
  TBS_RIGHT	The trackbar displays tick marks to the right of the control. This style is only valid with TBS_VERT.
  TBS_TOOLTIPS	The trackbar supports ToolTips. When you create a trackbar by using this style, a default ToolTip control that displays the current position of the slider is automatically created.
  TBS_TOP	The trackbar displays tick marks above the control. This style is only valid with TBS_HORZ.
  TBS_VERT	The trackbar is oriented vertically.

• bSelection
  [in] Boolean that specifies whether to highlight the selection range. TRUE indicate you want to highlight the selection range. FALSE indicates that you do not want to highlight the selection range.
• lSelStart
  [in] Long integer that specifies the start of the selection range.
• lSelEnd
  [in] Long integer that specifies the end of the selection range.
• lLogMin
  [in] Long integer that specifies the logical minimum of the trackbar.
• lLogMax
  [in] Long integer that specifies the logical maximum of the trackbar.
• iSizePhys
  [in] Long integer that specifies the size at which the thumb is placed.
• left
  [in] Integer that specifies the x-coordinate of the left side of the bounding rectangle for the trackbar.
• lprc
  [in] Long pointer to a RECT structure that specifies the bounding rectangle of the trackbar. For a horizontal trackbar, set the members of the RECT structure to the coordinates that the members ordinarily contain. For a vertical trackbar, swap the left and top members of the RECT structure, and swap the right and bottom members of the RECT structure. The following table shows the coordinates that you should use for the members of the RECT structure when calling this method for a vertical trackbar.

  Member	Description
  left	Specifies the y-coordinate of the upper-left corner of the bounding rectangle of the trackbar.
  top	Specifies the x-coordinate of the upper-left corner of the bounding rectangle of the trackbar.
  right	Specifies the y-coordinate of the lower-right corner of the bounding rectangle of the trackbar.
  bottom	Specifies the x-coordinate of the lower-right corner of the bounding rectangle of the trackbar.

Return Values

None.

Requirements

OS Versions: Windows CE .NET 4.0 and later.
Header: Trackbarview.hpp.

See Also

TrackBarView_t | TBM_SETTHUMBLENGTH | RECT

Last updated on Wednesday, April 13, 2005

© 2005 Microsoft Corporation. All rights reserved.