| middle mouse button emulation in widget_draw [message #45979] |
Fri, 21 October 2005 11:35  |
Benjamin Hornberger
Messages: 258
Registered: March 2004
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Senior Member |
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Hi all,
I was wondering if anybody has dealt with the following: In the IDL help
for widget_draw, "Note on Middle Mouse Button Emulation", it sais:
When a user holds down the Control key and presses the left mouse button
within a draw widget, IDL emulates a middle mouse button press. This
means that the event structure generated will have the PRESS field set
to 2 (middle button) and the MODIFIERS field set to 0 (no modifier). IDL
will never generate an event with PRESS set to 1 (left button) and
MODIFIERS set to 2 (control).
But (see test_draw.pro at the end of the message):
IDL Version 6.2, Microsoft Windows (Win32 x86 m32). (c) 2005, Research
Systems, Inc.
IDL> .compile test_draw
IDL> test_draw
;; Ctrl + Left-Click in draw widget
** Structure WIDGET_DRAW, 12 tags, length=44, data length=37:
ID LONG 564
TOP LONG 563
HANDLER LONG 564
TYPE INT 0
X LONG 59
Y LONG 20
PRESS BYTE 1
RELEASE BYTE 0
CLICKS LONG 1
MODIFIERS LONG 2
CH BYTE 0
KEY LONG 0
** Structure WIDGET_DRAW, 12 tags, length=44, data length=37:
ID LONG 564
TOP LONG 563
HANDLER LONG 564
TYPE INT 1
X LONG 59
Y LONG 20
PRESS BYTE 0
RELEASE BYTE 1
CLICKS LONG 1
MODIFIERS LONG 2
CH BYTE 0
KEY LONG 0
Same on IDL Version 6.2 (linux x86 m32), by the way.
So I guess it's safe to check for PRESS = 1 and MODIFIERS = 2, or does
anybody have other experiences? Any comments?
Thanks,
Benjamin
;;---------------------------------------------------------- ----
PRO test_draw_event, event
help, event, /str
END
PRO test_draw
tlb = widget_base()
draw = widget_draw(tlb, xs=100, ys=100, /button_events, $
event_PRO='test_draw_event')
widget_control, tlb, /realize
xmanager, 'draw', tlb, /no_block
END
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