Suggestion pop-up width API for ComboBox (#19685)

Added API setPopupWidth(String) to ComboBox. The suggestion pop-up now
has three different width modes:

1. Legacy "null"-mode: width is determined by the longest item
caption for each page. This looks & feels like the old implementation.
This is the default mode

2. Relative to the ComboBox. e.g. 100%

3. fixed width using any CSS definition
Change-Id: Id60a6996ee82726196b84d50c2d0d18a6cfb5ebf

1 files changed, 32 insertions, 1 deletions

diff --git a/server/src/main/java/com/vaadin/ui/ComboBox.java b/server/src/main/java/com/vaadin/ui/ComboBox.java
index b632cb0d8d..562173a9bf 100644
--- a/server/src/main/java/com/vaadin/ui/ComboBox.java
+++ b/server/src/main/java/com/vaadin/ui/ComboBox.java
@@ -121,6 +121,8 @@ public class ComboBox extends AbstractSelect implements
      */
     private boolean scrollToSelectedItem = true;
 
+    private String suggestionPopupWidth = null;
+
     /**
      * If text input is not allowed, the ComboBox behaves like a pretty
      * NativeSelect - the user can not enter any text and clicking the text
@@ -170,7 +172,7 @@ public class ComboBox extends AbstractSelect implements
     /**
      * Sets the input prompt - a textual prompt that is displayed when the
      * select would otherwise be empty, to prompt the user for input.
-     * 
+     *
      * @param inputPrompt
      *            the desired input prompt, or null to disable
      */
@@ -230,6 +232,11 @@ public class ComboBox extends AbstractSelect implements
 
             target.addAttribute("pagelength", pageLength);
 
+            if (suggestionPopupWidth != null) {
+                target.addAttribute("suggestionPopupWidth",
+                        suggestionPopupWidth);
+            }
+
             target.addAttribute("filteringmode", getFilteringMode().toString());
 
             // Paints the options and create array of selected id keys
@@ -875,6 +882,16 @@ public class ComboBox extends AbstractSelect implements
     }
 
     /**
+     * Returns the suggestion pop-up's width as a CSS string.
+     *
+     * @see #setPopupWidth
+     * @since 7.7
+     */
+    public String getPopupWidth() {
+        return suggestionPopupWidth;
+    }
+
+    /**
      * Sets the page length for the suggestion popup. Setting the page length to
      * 0 will disable suggestion popup paging (all items visible).
      * 
@@ -887,6 +904,20 @@ public class ComboBox extends AbstractSelect implements
     }
 
     /**
+     * Sets the suggestion pop-up's width as a CSS string. By using relative
+     * units (e.g. "50%") it's possible to set the popup's width relative to the
+     * ComboBox itself.
+     * 
+     * @see #getPopupWidth()
+     * @since 7.7
+     * @param width the width
+     */
+    public void setPopupWidth(String width) {
+        suggestionPopupWidth = width;
+        markAsDirty();
+    }
+
+    /**
      * Sets whether to scroll the selected item visible (directly open the page
      * on which it is) when opening the combo box popup or not. Only applies to
      * single select mode.