Double Click issues. UPDD assisted double click setting

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Sherman Strickland
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1 Double clicking on a touch screen relies on double click related settings set to a tolerance that allows a touch screen to be used to generate the double click. In most cases it is likely the double click function will work as expected with the standard driver or gesture settings but it is possible that with large touchscreens, especially infrared or optical, it may be more difficult and some of the settings below may help. UPDD assisted double click setting As discussed it is sometimes more difficult to double click elements with a touch screen than with a device such as a mouse due to the difficulty touching the same location with adequate accuracy twice avoiding movement of the touch during each of the clicks. UPDD supports an assisted double click feature that assists double clicking by generating a second touch at the same location of the previous one. Two device settings control this feature: assisted_double_click.time_ms This is a time in milliseconds. assisted_double_click.width_pixels This is a screen measurement in pixels. The actual values chosen for the settings will vary according to the screen resolution and the nature of the touch input; but in tests, ms = 500 to 750 and pixels 75 to 100 worked well. Use the command line interface to set the settings as required, e.g. upddutils set assisted_double_click.time_ms 100 An assisted double click will be performed when: 1. The time since the end of the previous touch is less than assisted_double_click.time_ms 2. The distance between the previous point of touch and the actual position of the second touch is less than assisted_double_click.width_pixels in either direction (X or Y) This means that two touches landing in approximately the same location within a short time interval are treated as being at exactly the same spot, making double clicking much easier. It should be born in mind that this does introduce a small deviation in the input in cases

where movement immediately follows touch, e.g. in drawing and in such cases this feature might not be desirable; however in most cases this effect will not be noticeable.

2 where movement immediately follows touch, e.g. in drawing and in such cases this feature might not be desirable; however in most cases this effect will not be noticeable. Windows settings The system mouse settings can be changed in Mouse properties as seen below: Most of these mouse dialogs allow the double click speed setting to be changed and this must be a slow (ish) setting to allow for touch double clicks. Too fast a setting will prevent

double clicks (if not using UPDD's Assisted Double Clicks feature). There are other related mouse settings in Windows. These are DoubleClickWidth and DoubleClickHeight (along with DoubleClickSpeed).

3 double clicks (if not using UPDD's Assisted Double Clicks feature). There are other related mouse settings in Windows. These are DoubleClickWidth and DoubleClickHeight (along with DoubleClickSpeed). These settings establish the width of the rectangle that Windows uses to detect double-clicks. If sequential clicks are positioned within the rectangle defined by DoubleClickHeight and DoubleClickWidth and occur within the time specified by DoubleClickSpeed they are interpreted as double-clicks. Otherwise, they are interpreted as sequential single clicks. Previous versions of UPDD set these internal settings to values that cater for finger double click usage but in some cases this could prevent a real mouse selecting items close to each other so these settings are no longer changed in preference of the Assisted Double Click feature described above. Should you want to change them the settings can be found in the registry at HKCU\Control Panel\Mouse using the RegEdit utility. The default Width and Height settings are 4 pixels and the speed is 500 milliseconds. UPDD previously set these settings to 32 and 370 respectively. New user issue If a new user logs in they will get the default Windows double click settings which again may make it difficult to double click. Settings changed by 3rd party software There have been cases of double click difficulties following the installation of mouse drivers that have reset these settings to values that prevent touch double clicks requiring the setting to be reset to touch values. Register settings Should you need to manually set the registry for the Double Click Settings these lines can

$00 [HKEY_CURRENT_USER\Control Panel\Mouse] "DoubleClickHeight"="32" "DoubleClickSpeed"="370" "DoubleClickWidth"="32" OS double click options One potentially useful setting in Windows, when using the$

4 be copied to a.reg file and double clicked to update the registry settings: Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\Control Panel\Mouse] "DoubleClickHeight"="32" "DoubleClickSpeed"="370" "DoubleClickWidth"="32" OS double click options One potentially useful setting in Windows, when using the desktop via touch, is to invoke icons, folders and files using a single click rather than double click. This setting is located in the folder options as shown below:

Mac OS X Under Mac the Mouse dialog is as follows: Disabling double click System level If touch double click is to be disabled we suggest that the settings be set such that it is almost impossible to

5 Mac OS X Under Mac the Mouse dialog is as follows: Disabling double click System level If touch double click is to be disabled we suggest that the settings be set such that it is almost impossible to achieve a double click with touch, such as a fast Double-Click speed. Under Windows you can try Height and Width = 1, speed = 200. Driver level You can set the driver to ignore pen up notifications and delay the pen up processing to be outside that of the Double-Click speed. If you set ignore_tip_switch and set liftoff_time_ms to a value > than needed for the OS to see the two touches as a double click then it will be difficult to generate a double click. Upddutils set ignore_tip_switch 1 Upddutils set liftoff_time_ms 500 (experiment with lowest value that prevents double click)

6 See However, pen ups on all touches will be delayed by the value you set. Touch-Base Support

EandT Touchscreen Driver helpviewer

EandT Touchscreen Driver helpviewer General information Welcome to UPDD version 4. Although the underlying driver is fundamentally the same as the version 3 driver this release addresses the issue of cross-platform