LImageViewer::IsButtonValid

#include "ltwrappr.h"

L_INT LImageViewer::IsButtonValid(nAction, nMouseButton, uFlags)

L_INT nAction;	/* action ID*/
L_INT nMouseButton;	/* mouse button */
L_UINT uFlags;	/* reserved for future use */

Checks the validity of assigning a button to a specific action.

Parameter	Description
nAction	Value that represents the action, which the user wants to check the validity of assigning a button to it. If nAction is equal to or greater than 100 then it's a user-defined action. Otherwise it should be one of the following predefined actions:
	Value	Meaning
	CONTAINER_ACTION_WINDOWLEVEL	[1] Window leveling
	CONTAINER_ACTION_SCALE	[2] Scaling
	CONTAINER_ACTION_OFFSET	[3] Offset
	CONTAINER_ACTION_STACK	[4] Stacking
	CONTAINER_ACTION_MAG	[5] Magnifying glass
	CONTAINER_ACTION_ALPHA	[6] Alpha
	CONTAINER_ACTION_ANNOTATION_RULER	[7] Ruler annotation
	CONTAINER_ACTION_ANNOTATION_ANGLE	[8] Angle annotation
	CONTAINER_ACTION_ANNOTATION_TEXT	[9] Text annotation
	CONTAINER_ACTION_ANNOTATION_ARROW	[10] Arrow annotation
	CONTAINER_ACTION_ANNOTATION_RECTANGLE	[11] Rectangle annotation
	CONTAINER_ACTION_ANNOTATION_ELLIPSE	[12] Ellipse annotation
	CONTAINER_ACTION_ANNOTATION_HILITE	[13] Hilite annotation
	CONTAINER_ACTION_REGION_RECTANGLE	[14] Rectangular region
	CONTAINER_ACTION_REGION_ELLIPSE	[15] Elliptical region
	CONTAINER_ACTION_REGION_FREEHAND	[16] Free hand region
	CONTAINER_ACTION_REGION_POLYGON	[17] Polygon region
	CONTAINER_ACTION_REGION_MAGICWAND	[18] Magic wand (contiguous color) region
	CONTAINER_ACTION_REGION_COLORRANGE	[19] Color range region
	CONTAINER_ACTION_REGION_CIRCLE	[20] Circular region
	CONTAINER_ACTION_REGION_SQUARE	[21] Square region
	CONTAINER_ACTION_REGION_NUDGETOOL	[22] Nudge tool
	CONTAINER_ACTION_REGION_SHRINKTOOL	[23] Shrink tool
nMouseButton	Pointer to a variable to be updated with the mouse button value. Possible values are:
	Value	Meaning
	CONTAINER_MOUSE_BUTTON_NONE	[0x000] No button is assigned.
	CONTAINER_MOUSE_BUTTON_LEFT	[0x001] Left mouse button.
	CONTAINER_MOUSE_BUTTON_RIGHT	[0x002] Right mouse button.
	CONTAINER_MOUSE_BUTTON_MIDDLE	[0x003] Middle mouse button.
	CONTAINER_MOUSE_WHEEL	[0x004] Mouse wheel.
	CONTAINER_MOUSE_BUTTON_XBUTTON1	[0x005] X button 1.
	CONTAINER_MOUSE_BUTTON_XBUTTON2	[0x006] X button 2.
uFlags	Reserved for future use. Pass 0.

Returns

SUCCESS	The mouse button is valid for this action.
0	The mouse button is not valid for this action.
< 1	An error occurred. Refer to Return Codes.

Comments

This function is preferred to use before calling the LImageViewer::SetAction function to check the validity of assigning a button to a specific action. For example, if the user passed CONTAINER_MOUSE_WHEEL to the nMouseButton parameter and CONTAINER_ACTION_MAG to the nAction parameter of the LImageViewer::SetAction function, it will return ERROR_INV_PARAMETER, while if the same values are passed as parameters to this function, it will return 0 as an indication that the mouse button is not valid for this action.

Required DLLs and Libraries

LTIVW

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

See Also

Functions:	LImageViewer::AddAction, LImageViewer::SetActionProperties, LImageViewer::GetActionProperties, LImageViewer::RemoveAction, LImageViewer::GetActionCount, LImageViewer::SetKeyboardAction, LImageViewer::GetKeyboardAction, LImageViewer::IsActionActive, LImageViewer::ActionCallBack, LImageViewer::EnableActionCallBack, LImageViewer::SetAction, LImageViewer::GetActionButton.
Topics:	Image Viewer Functions: Applying Actions
	Applying Actions

Example

This function assignes the magnify glass to the mouse button, but it will do nothing if the magnify glass was already assigned.

L_INT LImageViewer_IsButtonValid(LImageViewer& ImageViewer) 
{
   L_INT  nButton; 
   L_UINT uFlag; 
   L_INT nRet; 
   L_INT nMouseButton = CONTAINER_MOUSE_BUTTON_LEFT;
   nRet = ImageViewer.GetActionButton(CONTAINER_ACTION_MAG, &nButton, &uFlag); 
   if (nRet != SUCCESS) 
      return nRet; 
   if (!nButton) 
   {
      if (ImageViewer.IsButtonValid(CONTAINER_ACTION_MAG, nMouseButton, 0)) 
      {
         nRet = ImageViewer.SetAction (CONTAINER_ACTION_MAG, nMouseButton, 0); 
         if (nRet != SUCCESS) 
            return nRet; 
      }
   }
   return SUCCESS; 
}