Difference between revisions of "Unit HIDTOUCH"
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Revision as of 03:30, 16 November 2022
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Description
Ultibo HID Touch Consumer unit
HID Touch
This is a consumer for any generic HID touch screen, it accepts HID application collections in the digitizer device page (HID_PAGE_DIGITIZERS) with the usage set to touch screen (HID_DIGITIZERS_TOUCH_SCREEN).
The consumer will bind to any touch collection that implements at a minimum the X and Y axis and the tip switch. The event data for in range, confidence, width and height are not currently reported but may be added if required.
To prevent the HID mouse consumer from binding to touch screen devices that also include a mouse collection, this consumer sets the HID_MOUSE_REJECT_TOUCH variable to True during initialization.
Constants
HID_TOUCH_* HID_TOUCH_CONSUMER_NAME = 'HID Touch Consumer';
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Name of HID Touch consumer |
HID_TOUCH_DESCRIPTION = 'HID Touch';
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Description of HID Touch device |
Type definitions
HID touch point
PHIDTouchPoint = ^THIDTouchPoint;
THIDTouchPoint = record
X:LongWord;
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Y:LongWord;
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Width:LongWord;
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Height:LongWord;
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Pressure:LongWord;
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TipSwitch:Boolean;
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InRange:Boolean;
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Confidence:Boolean;
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Identifier:LongWord;
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HID touch points
PHIDTouchPoints = ^THIDTouchPoints;
THIDTouchPoints = array[0..0] of THIDTouchPoint;
HID touch device
PHIDTouchDevice = ^THIDTouchDevice;
THIDTouchDevice = record
| Touch Properties | |
Touch:TTouchDevice;
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| General Properties | |
MaxX:LongWord;
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Maximum X value from current configuration |
MaxY:LongWord;
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Maximum Y value from current configuration |
MaxZ:LongWord;
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Maximum Z value from current configuration |
MaxPoints:LongWord;
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Maximum touch points for this device |
LastCount:LongWord;
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Number of touch points for last touch report |
LastPoints:PHIDTouchPoints;
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Touch points for last touch report |
TouchPoints:PHIDTouchPoints;
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Touch points for current touch report |
| HID Properties | |
Timer:TTimerHandle;
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Handle for touch release timer |
Collection:PHIDCollection;
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The HID collection this touch is bound to |
Definitions:PHIDDefinition;
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The input report definitions that can be accepted as touch reports |
FeatureDefinition:PHIDDefinition;
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The report definition that corresponds to the maximum contact count feature |
Public variables
None defined
Function declarations
Initialization functions
procedure HIDTouchInit;
| Note | Called only during system startup |
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HID touch functions
function HIDTouchStart(Touch:PTouchDevice):LongWord;
| Note | Not intended to be called directly by applications, use TouchDeviceStart instead. |
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function HIDTouchStop(Touch:PTouchDevice):LongWord;
| Note | Not intended to be called directly by applications, use TouchDeviceStop instead. |
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function HIDTouchUpdate(Touch:PTouchDevice):LongWord;
| Note | Not intended to be called directly by applications, use TouchDeviceUpdate instead. |
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HID touch helper functions
function HIDTouchCheckCollection(Collection:PHIDCollection):LongWord;
| Note | None documented |
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function HIDTouchCheckInputDefinition(Definition:PHIDDefinition):LongWord;
| Note | None documented |
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function HIDTouchCheckFeatureDefinition(Definition:PHIDDefinition):LongWord;
| Note | A touch feature report is commonly used to report the maximum number of contacts |
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