rui_orig/pointerEvents.go

342 lines
11 KiB
Go
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

package rui
import (
"strings"
)
const (
// PointerDown is the constant for "pointer-down" property tag.
// The "pointer-down" event is fired when a pointer becomes active. For mouse, it is fired when
// the device transitions from no buttons depressed to at least one button depressed.
// For touch, it is fired when physical contact is made with the digitizer.
// For pen, it is fired when the stylus makes physical contact with the digitizer.
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerDown = "pointer-down"
// PointerUp is the constant for "pointer-up" property tag.
// The "pointer-up" event is fired when a pointer is no longer active.
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerUp = "pointer-up"
// PointerMove is the constant for "pointer-move" property tag.
// The "pointer-move" event is fired when a pointer changes coordinates.
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerMove = "pointer-move"
// PointerCancel is the constant for "pointer-cancel" property tag.
// The "pointer-cancel" event is fired if the pointer will no longer be able to generate events
// (for example the related device is deactivated).
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerCancel = "pointer-cancel"
// PointerOut is the constant for "pointer-out" property tag.
// The "pointer-out" event is fired for several reasons including: pointing device is moved out
// of the hit test boundaries of an element; firing the pointerup event for a device
// that does not support hover (see "pointer-up"); after firing the pointercancel event (see "pointer-cancel");
// when a pen stylus leaves the hover range detectable by the digitizer.
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerOut = "pointer-out"
// PointerOver is the constant for "pointer-over" property tag.
// The "pointer-over" event is fired when a pointing device is moved into an view's hit test boundaries.
// The main listener format: func(View, PointerEvent).
// The additional listener formats: func(PointerEvent), func(View), and func().
PointerOver = "pointer-over"
)
type PointerEvent struct {
MouseEvent
// PointerID is a unique identifier for the pointer causing the event.
PointerID int
// Width is the width (magnitude on the X axis), in pixels, of the contact geometry of the pointer.
Width float64
// Height is the height (magnitude on the Y axis), in pixels, of the contact geometry of the pointer.
Height float64
// Pressure is the normalized pressure of the pointer input in the range 0 to 1, where 0 and 1 represent
// the minimum and maximum pressure the hardware is capable of detecting, respectively.
Pressure float64
// TangentialPressure is the normalized tangential pressure of the pointer input (also known
// as barrel pressure or cylinder stress) in the range -1 to 1, where 0 is the neutral position of the control.
TangentialPressure float64
// TiltX is the plane angle (in degrees, in the range of -90 to 90) between the YZ plane
// and the plane containing both the pointer (e.g. pen stylus) axis and the Y axis.
TiltX float64
// TiltY is the plane angle (in degrees, in the range of -90 to 90) between the XZ plane
// and the plane containing both the pointer (e.g. pen stylus) axis and the X axis.
TiltY float64
// Twist is the clockwise rotation of the pointer (e.g. pen stylus) around its major axis in degrees,
// with a value in the range 0 to 359.
Twist float64
// PointerType indicates the device type that caused the event ("mouse", "pen", "touch", etc.)
PointerType string
// IsPrimary indicates if the pointer represents the primary pointer of this pointer type.
IsPrimary bool
}
func valueToPointerListeners(value interface{}) ([]func(View, PointerEvent), bool) {
if value == nil {
return nil, true
}
switch value := value.(type) {
case func(View, PointerEvent):
return []func(View, PointerEvent){value}, true
case func(PointerEvent):
fn := func(view View, event PointerEvent) {
value(event)
}
return []func(View, PointerEvent){fn}, true
case func(View):
fn := func(view View, event PointerEvent) {
value(view)
}
return []func(View, PointerEvent){fn}, true
case func():
fn := func(view View, event PointerEvent) {
value()
}
return []func(View, PointerEvent){fn}, true
case []func(View, PointerEvent):
if len(value) == 0 {
return nil, true
}
for _, fn := range value {
if fn == nil {
return nil, false
}
}
return value, true
case []func(PointerEvent):
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, PointerEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
listeners[i] = func(view View, event PointerEvent) {
v(event)
}
}
return listeners, true
case []func(View):
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, PointerEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
listeners[i] = func(view View, event PointerEvent) {
v(view)
}
}
return listeners, true
case []func():
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, PointerEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
listeners[i] = func(view View, event PointerEvent) {
v()
}
}
return listeners, true
case []interface{}:
count := len(value)
if count == 0 {
return nil, true
}
listeners := make([]func(View, PointerEvent), count)
for i, v := range value {
if v == nil {
return nil, false
}
switch v := v.(type) {
case func(View, PointerEvent):
listeners[i] = v
case func(PointerEvent):
listeners[i] = func(view View, event PointerEvent) {
v(event)
}
case func(View):
listeners[i] = func(view View, event PointerEvent) {
v(view)
}
case func():
listeners[i] = func(view View, event PointerEvent) {
v()
}
default:
return nil, false
}
}
return listeners, true
}
return nil, false
}
var pointerEvents = map[string]struct{ jsEvent, jsFunc string }{
PointerDown: {jsEvent: "onpointerdown", jsFunc: "pointerDownEvent"},
PointerUp: {jsEvent: "onpointerup", jsFunc: "pointerUpEvent"},
PointerMove: {jsEvent: "onpointermove", jsFunc: "pointerMoveEvent"},
PointerCancel: {jsEvent: "onpointercancel", jsFunc: "pointerCancelEvent"},
PointerOut: {jsEvent: "onpointerout", jsFunc: "pointerOutEvent"},
PointerOver: {jsEvent: "onpointerover", jsFunc: "pointerOverEvent"},
}
func (view *viewData) setPointerListener(tag string, value interface{}) bool {
listeners, ok := valueToPointerListeners(value)
if !ok {
notCompatibleType(tag, value)
return false
}
if listeners == nil {
view.removePointerListener(tag)
} else if js, ok := pointerEvents[tag]; ok {
view.properties[tag] = listeners
if view.created {
updateProperty(view.htmlID(), js.jsEvent, js.jsFunc+"(this, event)", view.Session())
}
} else {
return false
}
return true
}
func (view *viewData) removePointerListener(tag string) {
delete(view.properties, tag)
if view.created {
if js, ok := pointerEvents[tag]; ok {
updateProperty(view.htmlID(), js.jsEvent, "", view.Session())
}
}
}
func getPointerListeners(view View, subviewID string, tag string) []func(View, PointerEvent) {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view != nil {
if value := view.Get(tag); value != nil {
if result, ok := value.([]func(View, PointerEvent)); ok {
return result
}
}
}
return []func(View, PointerEvent){}
}
func pointerEventsHtml(view View, buffer *strings.Builder) {
for tag, js := range pointerEvents {
if value := view.getRaw(tag); value != nil {
if listeners, ok := value.([]func(View, PointerEvent)); ok && len(listeners) > 0 {
buffer.WriteString(js.jsEvent + `="` + js.jsFunc + `(this, event)" `)
}
}
}
}
func (event *PointerEvent) init(data DataObject) {
event.MouseEvent.init(data)
event.PointerID = dataIntProperty(data, "pointerId")
event.Width = dataFloatProperty(data, "width")
event.Height = dataFloatProperty(data, "height")
event.Pressure = dataFloatProperty(data, "pressure")
event.TangentialPressure = dataFloatProperty(data, "tangentialPressure")
event.TiltX = dataFloatProperty(data, "tiltX")
event.TiltY = dataFloatProperty(data, "tiltY")
event.Twist = dataFloatProperty(data, "twist")
value, _ := data.PropertyValue("pointerType")
event.PointerType = value
event.IsPrimary = dataBoolProperty(data, "isPrimary")
}
func handlePointerEvents(view View, tag string, data DataObject) {
listeners := getPointerListeners(view, "", tag)
if len(listeners) == 0 {
return
}
var event PointerEvent
event.init(data)
for _, listener := range listeners {
listener(view, event)
}
}
// GetPointerDownListeners returns the "pointer-down" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerDownListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerDown)
}
// GetPointerUpListeners returns the "pointer-up" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerUpListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerUp)
}
// GetPointerMoveListeners returns the "pointer-move" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerMoveListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerMove)
}
// GetPointerCancelListeners returns the "pointer-cancel" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerCancelListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerCancel)
}
// GetPointerOverListeners returns the "pointer-over" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerOverListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerOver)
}
// GetPointerOutListeners returns the "pointer-out" listener list. If there are no listeners then the empty list is returned.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func GetPointerOutListeners(view View, subviewID string) []func(View, PointerEvent) {
return getPointerListeners(view, subviewID, PointerOut)
}