Mouse wheel by 3

[nikiroo-utils.git] / src / jexer / TEditorWidget.java

diff --git a/src/jexer/TEditorWidget.java b/src/jexer/TEditorWidget.java
index 8d2a0104b4c598aec5de23f06a4e879e4871171a..823dea2d113c2d62b66e164dc06b2ce070e8cb69 100644 (file)
--- a/src/jexer/TEditorWidget.java
+++ b/src/jexer/TEditorWidget.java
@@ -45,6 +45,11 @@ import static jexer.TKeypress.*;
  */
 public final class TEditorWidget extends TWidget {
 
+    /**
+     * The number of lines to scroll on mouse wheel up/down.
+     */
+    private static final int wheelScrollSize = 3;
+
     /**
      * The document being edited.
      */
@@ -122,16 +127,20 @@ public final class TEditorWidget extends TWidget {
     @Override
     public void onMouseDown(final TMouseEvent mouse) {
         if (mouse.isMouseWheelUp()) {
-            if (topLine > 0) {
-                topLine--;
-                alignDocument(false);
+            for (int i = 0; i < wheelScrollSize; i++) {
+                if (topLine > 0) {
+                    topLine--;
+                    alignDocument(false);
+                }
             }
             return;
         }
         if (mouse.isMouseWheelDown()) {
-            if (topLine < document.getLineCount() - 1) {
-                topLine++;
-                alignDocument(true);
+            for (int i = 0; i < wheelScrollSize; i++) {
+                if (topLine < document.getLineCount() - 1) {
+                    topLine++;
+                    alignDocument(true);
+                }
             }
             return;
         }
@@ -183,8 +192,13 @@ public final class TEditorWidget extends TWidget {
             // Need to move topLine to bring document back into view.
             if (topLineIsTop) {
                 topLine = line - (getHeight() - 1);
+                if (topLine < 0) {
+                    topLine = 0;
+                }
+                assert (topLine >= 0);
             } else {
                 topLine = line;
+                assert (topLine >= 0);
             }
         }
 
@@ -193,6 +207,7 @@ public final class TEditorWidget extends TWidget {
         */
 
         // Document is in view, let's set cursorY
+        assert (line >= topLine);
         setCursorY(line - topLine);
         alignCursor();
     }
@@ -385,7 +400,11 @@ public final class TEditorWidget extends TWidget {
      * @param row the new editing row number.  Row 1 is the first row.
      */
     public void setEditingRowNumber(final int row) {
-        document.setLineNumber(row - 1);
+        assert (row > 0);
+        if ((row > 0) && (row < document.getLineCount())) {
+            document.setLineNumber(row - 1);
+            alignTopLine(true);
+        }
     }
 
     /**
@@ -404,7 +423,10 @@ public final class TEditorWidget extends TWidget {
      * column.
      */
     public void setEditingColumnNumber(final int column) {
-        document.setCursor(column - 1);
+        if ((column > 0) && (column < document.getLineLength())) {
+            document.setCursor(column - 1);
+            alignCursor();
+        }
     }
 
     /**