#19 expose home/end for TField

[fanfix.git] / src / jexer / TField.java

diff --git a/src/jexer/TField.java b/src/jexer/TField.java
index fbe726bc04ca2f1d68a38155569890a2780166e3..c93cecbcbf97670babe1d07d26508498467a3030 100644 (file)
--- a/src/jexer/TField.java
+++ b/src/jexer/TField.java
@@ -218,7 +218,8 @@ public class TField extends TWidget {
     }
 
     /**
-     * Update the cursor position.
+     * Update the visible cursor position to match the location of position
+     * and windowStart.
      */
     protected void updateCursor() {
         if ((position > getWidth()) && fixed) {
@@ -230,6 +231,23 @@ public class TField extends TWidget {
         }
     }
 
+    /**
+     * Normalize windowStart such that most of the field data if visible.
+     */
+    protected void normalizeWindowStart() {
+        if (fixed) {
+            // windowStart had better be zero, there is nothing to do here.
+            assert (windowStart == 0);
+            return;
+        }
+        windowStart = position - (getWidth() - 1);
+        if (windowStart < 0) {
+            windowStart = 0;
+        }
+
+        updateCursor();
+    }
+
     /**
      * Handle mouse button presses.
      *
@@ -268,6 +286,7 @@ public class TField extends TWidget {
                     windowStart--;
                 }
             }
+            normalizeWindowStart();
             return;
         }
 
@@ -297,23 +316,12 @@ public class TField extends TWidget {
             return;
         }
         if (keypress.equals(kbHome)) {
-            position = 0;
-            windowStart = 0;
+            home();
             return;
         }
 
         if (keypress.equals(kbEnd)) {
-            position = text.length();
-            if (fixed == true) {
-                if (position >= getWidth()) {
-                    position = text.length() - 1;
-                }
-            } else {
-                windowStart = text.length() - getWidth() + 1;
-                if (windowStart < 0) {
-                    windowStart = 0;
-                }
-            }
+            end();
             return;
         }
 
@@ -322,6 +330,7 @@ public class TField extends TWidget {
                 text = text.substring(0, position)
                         + text.substring(position + 1);
             }
+            dispatch(false);
             return;
         }
 
@@ -339,6 +348,7 @@ public class TField extends TWidget {
                 }
             }
             dispatch(false);
+            normalizeWindowStart();
             return;
         }
 
@@ -446,4 +456,48 @@ public class TField extends TWidget {
         }
     }
 
+    /**
+     * Position the cursor at the first column.  The field may adjust the
+     * window start to show as much of the field as possible.
+     */
+    public void home() {
+        position = 0;
+        windowStart = 0;
+    }
+
+    /**
+     * Set the editing position to the last filled character.  The field may
+     * adjust the window start to show as much of the field as possible.
+     */
+    public void end() {
+        position = text.length();
+        if (fixed == true) {
+            if (position >= getWidth()) {
+                position = text.length() - 1;
+            }
+        } else {
+            windowStart = text.length() - getWidth() + 1;
+            if (windowStart < 0) {
+                windowStart = 0;
+            }
+        }
+    }
+
+    /**
+     * Set the editing position.  The field may adjust the window start to
+     * show as much of the field as possible.
+     *
+     * @param position the new position
+     * @throws IndexOutOfBoundsException if position is outside the range of
+     * the available text
+     */
+    public void setPosition(final int position) {
+        if ((position < 0) || (position >= text.length())) {
+            throw new IndexOutOfBoundsException("Max length is " +
+                text.length() + ", requested position " + position);
+        }
+        this.position = position;
+        normalizeWindowStart();
+    }
+
 }