add files

assets/wvbrowser_ui/controls_ui/history.js

@@ -0,0 +1,143 @@
+const INVALID_HISTORY_ID = -1;
+
+function addHistoryItem(item, callback) {
+    queryDB((db) => {
+        let transaction = db.transaction(['history'], 'readwrite');
+        let historyStore = transaction.objectStore('history');
+
+        // Check if an item for this URI exists on this day
+        let currentDate = new Date();
+        let year = currentDate.getFullYear();
+        let month = currentDate.getMonth();
+        let date = currentDate.getDate();
+        let todayDate = new Date(year, month, date);
+
+        let existingItemsIndex = historyStore.index('stampedURI');
+        let lowerBound = [item.uri, todayDate];
+        let upperBound = [item.uri, currentDate];
+        let range = IDBKeyRange.bound(lowerBound, upperBound);
+        let request = existingItemsIndex.openCursor(range);
+
+        request.onsuccess = function(event) {
+            let cursor = event.target.result;
+            if (cursor) {
+                // There's an entry for this URI, update the item
+                cursor.value.timestamp = item.timestamp;
+                let updateRequest = cursor.update(cursor.value);
+
+                updateRequest.onsuccess = function(event) {
+                    if (callback) {
+                        callback(event.target.result.primaryKey);
+                    }
+                };
+            } else {
+                // No entry for this URI, add item
+                let addItemRequest = historyStore.add(item);
+
+                addItemRequest.onsuccess = function(event) {
+                    if (callback) {
+                        callback(event.target.result);
+                    }
+                };
+            }
+        };
+
+    });
+}
+
+function updateHistoryItem(id, item, callback) {
+    if (!id) {
+        return;
+    }
+
+    queryDB((db) => {
+        let transaction = db.transaction(['history'], 'readwrite');
+        let historyStore = transaction.objectStore('history');
+        let storedItemRequest = historyStore.get(id);
+        storedItemRequest.onsuccess = function(event) {
+            let storedItem = event.target.result;
+            item.timestamp = storedItem.timestamp;
+
+            let updateRequest = historyStore.put(item, id);
+
+            updateRequest.onsuccess = function(event) {
+                if (callback) {
+                    callback();
+                }
+            };
+        };
+
+    });
+}
+
+function getHistoryItems(from, n, callback) {
+    if (n <= 0 || from < 0) {
+        if (callback) {
+            callback([]);
+        }
+    }
+
+    queryDB((db) => {
+        let transaction = db.transaction(['history']);
+        let historyStore = transaction.objectStore('history');
+        let timestampIndex = historyStore.index('timestamp');
+        let cursorRequest = timestampIndex.openCursor(null, 'prev');
+
+        let current = 0;
+        let items = [];
+        cursorRequest.onsuccess = function(event) {
+            let cursor = event.target.result;
+
+            if (!cursor || current >= from + n) {
+                if (callback) {
+                    callback(items);
+                }
+
+                return;
+            }
+
+            if (current >= from) {
+                items.push({
+                    id: cursor.primaryKey,
+                    item: cursor.value
+                });
+            }
+
+            ++current;
+            cursor.continue();
+        };
+    });
+}
+
+function removeHistoryItem(id, callback) {
+    queryDB((db) => {
+        let transaction = db.transaction(['history'], 'readwrite');
+        let historyStore = transaction.objectStore('history');
+        let removeItemRequest = historyStore.delete(id);
+
+        removeItemRequest.onerror = function(event) {
+            console.log(`Could not remove history item with ID: ${id}`);
+            console.log(event.target.error.message);
+        };
+
+        removeItemRequest.onsuccess = function(event) {
+            if (callback) {
+                callback();
+            }
+        };
+    });
+}
+
+function clearHistory(callback) {
+    queryDB((db) => {
+        let transaction = db.transaction(['history'], 'readwrite');
+        let historyStore = transaction.objectStore('history');
+        let clearRequest = historyStore.clear();
+
+        clearRequest.onsuccess = function(event) {
+            if (callback) {
+                callback();
+            }
+        };
+    });
+}