Abstract out key conditions for interactions, fixes #51, see also #54

2012-10-08 12:55:20 +02:00
parent a14a15159f
commit 8df0cfb9d9
6 changed files with 119 additions and 25 deletions
@@ -0,0 +1,56 @@
+goog.provide('ol.interaction.ConditionType');
+goog.provide('ol.interaction.condition');
+
+
+/**
+ * @typedef {function(goog.events.BrowserEvent): boolean}
+ */
+ol.interaction.ConditionType;
+
+
+/**
+ * @param {goog.events.BrowserEvent} browserEvent Browser event.
+ * @return {boolean} True if only the alt key is pressed.
+ */
+ol.interaction.condition.altKeyOnly = function(browserEvent) {
+  return (
+      browserEvent.altKey &&
+      !browserEvent.platformModifierKey &&
+      !browserEvent.shiftKey);
+};
+
+
+/**
+ * @param {goog.events.BrowserEvent} browserEvent Browser event.
+ * @return {boolean} True if only the no modifier keys are pressed.
+ */
+ol.interaction.condition.noModifierKeys = function(browserEvent) {
+  return (
+      !browserEvent.altKey &&
+      !browserEvent.platformModifierKey &&
+      !browserEvent.shiftKey);
+};
+
+
+/**
+ * @param {goog.events.BrowserEvent} browserEvent Browser event.
+ * @return {boolean} True if only the platform modifier key is pressed.
+ */
+ol.interaction.condition.platformModifierKeyOnly = function(browserEvent) {
+  return (
+      !browserEvent.altKey &&
+      browserEvent.platformModifierKey &&
+      !browserEvent.shiftKey);
+};
+
+
+/**
+ * @param {goog.events.BrowserEvent} browserEvent Browser event.
+ * @return {boolean} True if only the shift key is pressed.
+ */
+ol.interaction.condition.shiftKeyOnly = function(browserEvent) {
+  return (
+      !browserEvent.altKey &&
+      !browserEvent.platformModifierKey &&
+      browserEvent.shiftKey);
+};