TextSingleton: implement API for getting current item with selection

On some platforms (iOS) you can select text without giving
focus to the input. To be able to clear selection from other
parts of the code (iOS will only let one input have selection
at a time), we need to track this. Later patches will make
use of it.

Change-Id: I4689253b439e0a86349e53c2edf2554fc96225f8
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>

2 files changed, 25 insertions, 1 deletions

diff --git a/src/controls/Private/TextInputWithHandles.qml b/src/controls/Private/TextInputWithHandles.qml
index cace83f6..59ba971e 100644
--- a/src/controls/Private/TextInputWithHandles.qml
+++ b/src/controls/Private/TextInputWithHandles.qml
@@ -38,6 +38,7 @@
 **
 ****************************************************************************/
 import QtQuick 2.2
+import QtQuick.Controls.Private 1.0
 
 TextInput {
     id: input
@@ -71,6 +72,7 @@ TextInput {
             selectionHandle.position = (selectionStart !== cursorPosition) ? selectionStart : selectionEnd
             blockRecursion = false
         }
+        TextSingleton.updateSelectionItem(input)
     }
 
     function activate() {
diff --git a/src/controls/Private/TextSingleton.qml b/src/controls/Private/TextSingleton.qml
index 7bccdd55..3ff89af0 100644
--- a/src/controls/Private/TextSingleton.qml
+++ b/src/controls/Private/TextSingleton.qml
@@ -33,4 +33,26 @@
 
 pragma Singleton
 import QtQuick 2.2
-Text {}
+Text {
+    /**
+      selectionItem is the item that currently has a text selection. On some platforms
+      (iOS) you can select text without activating the input field. This means that
+      selectionItem can be different from item with active focus on those platforms.
+      */
+    property Item selectionItem: null
+
+    function updateSelectionItem(item)
+    {
+        // Convenience function to check if we should transfer or
+        // remove selectionItem status from item.
+        var selection = item.selectionStart !== item.selectionEnd
+        if (item === selectionItem) {
+            if (!selection)
+                selectionItem = null
+        } else if (selection) {
+            if (selectionItem)
+                selectionItem.select(selectionItem.cursorPosition, selectionItem.cursorPosition)
+            selectionItem = item
+        }
+    }
+}