Multi-Room Chat (#4)

* # This is a combination of 4 commits.
# This is the 1st commit message:

Chatroom example

# This is the commit message #2:

Avatar styling

# This is the commit message #3:

Styling

# This is the commit message #4:

cleanup

* Chatroom example

Avatar styling

Benchmark tests

Cleanup

ignore

Files

Cleanroom chatroom impl

* Rewrite.

* changes

* Fix Deadlocks. Start the rooms. Fix styling. Random things. Bookmarklet.

* Subset data

* Rm file

* Simplify User. Just Comparable.

* Remove method.

actiontrigger.go

@@ -2,6 +2,7 @@ package via
 
 import (
 	"fmt"
+	"strconv"
 
 	"github.com/go-via/via/h"
 )
@@ -11,14 +12,85 @@ type actionTrigger struct {
 	id string
 }
 
-// OnClick returns a via.h DOM node that triggers on click. It can be added
-// to element nodes in a view.
-func (a *actionTrigger) OnClick() h.H {
-	return h.Data("on:click", fmt.Sprintf("@get('/_action/%s')", a.id))
+// ActionTriggerOption configures behavior of action triggers
+type ActionTriggerOption interface {
+	apply(*triggerOpts)
 }
 
-// OnChange returns a via.h DOM node that triggers on input change. It can be added
-// to element nodes in a view.
-func (a *actionTrigger) OnChange() h.H {
-	return h.Data("on:change__debounce.200ms", fmt.Sprintf("@get('/_action/%s')", a.id))
+type triggerOpts struct {
+	hasSignal bool
+	signalID  string
+	value     string
+}
+
+type withSignalOpt struct {
+	signalID string
+	value    string
+}
+
+func (o withSignalOpt) apply(opts *triggerOpts) {
+	opts.hasSignal = true
+	opts.signalID = o.signalID
+	opts.value = o.value
+}
+
+// WithSignal sets a signal value before triggering the action.
+func WithSignal(sig *signal, value string) ActionTriggerOption {
+	return withSignalOpt{
+		signalID: sig.ID(),
+		value:    fmt.Sprintf("'%s'", value),
+	}
+}
+
+// WithSignalInt sets a signal to an int value before triggering the action.
+func WithSignalInt(sig *signal, value int) ActionTriggerOption {
+	return withSignalOpt{
+		signalID: sig.ID(),
+		value:    strconv.Itoa(value),
+	}
+}
+
+func buildOnExpr(base string, opts *triggerOpts) string {
+	if !opts.hasSignal {
+		return base
+	}
+	return fmt.Sprintf("$%s=%s;%s", opts.signalID, opts.value, base)
+}
+
+func applyOptions(options ...ActionTriggerOption) triggerOpts {
+	var opts triggerOpts
+	for _, opt := range options {
+		opt.apply(&opts)
+	}
+	return opts
+}
+
+func actionURL(id string) string {
+	return fmt.Sprintf("@get('/_action/%s')", id)
+}
+
+// OnClick returns a via.h DOM attribute that triggers on click. It can be added
+// to element nodes in a view.
+func (a *actionTrigger) OnClick(options ...ActionTriggerOption) h.H {
+	opts := applyOptions(options...)
+	return h.Data("on:click", buildOnExpr(actionURL(a.id), &opts))
+}
+
+// OnChange returns a via.h DOM attribute that triggers on input change. It can be added
+// to element nodes in a view.
+func (a *actionTrigger) OnChange(options ...ActionTriggerOption) h.H {
+	opts := applyOptions(options...)
+	return h.Data("on:change__debounce.200ms", buildOnExpr(actionURL(a.id), &opts))
+}
+
+// OnEnterKey returns a via.h DOM attribute that triggers when a key is pressed.
+// key: optional, see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key
+// Example: OnKeyDown("Enter")
+func (a *actionTrigger) OnKeyDown(key string, options ...ActionTriggerOption) h.H {
+	opts := applyOptions(options...)
+	var condition string
+	if key != "" {
+		condition = fmt.Sprintf("evt.key==='%s' &&", key)
+	}
+	return h.Data("on:keydown", fmt.Sprintf("%s%s", condition, buildOnExpr(actionURL(a.id), &opts)))
 }