From a5873ae2b89d7ac8fc650a0f75778f8dad07a102 Mon Sep 17 00:00:00 2001
From: Jonas Suhr Christensen <jsc@umbraculum.org>
Date: Tue, 30 Sep 2014 11:49:37 +0200
Subject: Following marker.

---
 plugingui/lineedit.cc | 75 +++++++++++++++++++++++++++++++++++++++++++--------
 plugingui/lineedit.h  |  9 +++++++
 2 files changed, 73 insertions(+), 11 deletions(-)

diff --git a/plugingui/lineedit.cc b/plugingui/lineedit.cc
index 9c14ab6..46354bb 100644
--- a/plugingui/lineedit.cc
+++ b/plugingui/lineedit.cc
@@ -30,6 +30,8 @@
 
 #include "window.h"
 
+#include <assert.h>
+
 #include <hugin.hpp>
 
 #define BORDER 10
@@ -38,6 +40,7 @@ GUI::LineEdit::LineEdit(Widget *parent)
   : GUI::Widget(parent)
 {
   pos = 0;
+  offsetpos = 0;
   setReadOnly(false);
 
   box.topLeft     = new Image(":widget_tl.png");
@@ -72,7 +75,8 @@ bool GUI::LineEdit::readOnly()
 void GUI::LineEdit::setText(std::string text)
 {
   _text = text;
-  if(_text.size() < pos) pos = text.size();
+  pos = text.size();
+//  if(_text.size() < pos) pos = text.size();
   
   repaintEvent(NULL);
   textChanged();
@@ -87,14 +91,16 @@ void GUI::LineEdit::buttonEvent(ButtonEvent *e)
 {
   if(readOnly()) return;
 
+
   if(e->direction == 1) {
-    for(int i = 0; i < (int)_text.length(); i++) {
-      if(e->x < (int)(font.textWidth(_text.substr(0, i)) + BORDER)) {
-        pos = i;
+    for(int i = 0; i < (int)_visibletext.length(); i++) {
+      if(e->x < (int)(font.textWidth(_visibletext.substr(0, i)) + BORDER)) {
+        printf("i, Offset: %d, %d\n", i, offsetpos);
+        pos = i + offsetpos;
         break;
       }
     }
-    if(e->x >= (int)(font.textWidth(_text) + BORDER)) pos = _text.length();
+//    if(e->x >= (int)(font.textWidth(_visibletext) + BORDER)) pos = _visibletext.length();
     repaintEvent(NULL);
   }
 }
@@ -111,7 +117,9 @@ void GUI::LineEdit::keyEvent(GUI::KeyEvent *e)
 
     if(e->keycode == GUI::KeyEvent::KEY_LEFT) {
       if(pos) pos--;
-
+      if(offsetpos >= pos) walkstate = WALK_LEFT;
+//      else walkstate = NOOP;
+    
     } else if(e->keycode == GUI::KeyEvent::KEY_HOME) {
       pos = 0;
 
@@ -120,7 +128,9 @@ void GUI::LineEdit::keyEvent(GUI::KeyEvent *e)
 
     } else if(e->keycode == GUI::KeyEvent::KEY_RIGHT) {
       if(pos < _text.length()) pos++;
-
+      if(offsetpos + _visibletext.length() <= pos) walkstate = WALK_RIGHT;
+//      else walkstate = NOOP;
+    
     } else if(e->keycode == GUI::KeyEvent::KEY_DELETE) {
       if(pos < _text.length()) {
         std::string t = _text.substr(0, pos);
@@ -144,6 +154,7 @@ void GUI::LineEdit::keyEvent(GUI::KeyEvent *e)
       _text = pre + e->text + post;
       change = true;
       pos++;
+
     } else if(e->keycode == GUI::KeyEvent::KEY_ENTER) {
       if(handler) handler(ptr);
     }
@@ -165,18 +176,60 @@ void GUI::LineEdit::repaintEvent(GUI::RepaintEvent *e)
   p.drawBox(0, 0, &box, w, h);
 
   p.setColour(GUI::Colour(183.0/255.0, 219.0/255.0 , 255.0/255.0, 1));
-  p.drawText(BORDER - 4 + 3, height()/2+5 + 1 + 1 + 1, font, _text);
+
+  if(walkstate == WALK_LEFT) {
+    _visibletext = _text.substr(pos, std::string::npos);
+    offsetpos = pos;
+  }
+  else if(walkstate == WALK_RIGHT) {
+    int d = (offsetpos < _text.length()) ? 1 : 0;
+    _visibletext = _text.substr(offsetpos + d);
+    offsetpos = offsetpos + d;
+  }
+  else {
+    _visibletext = _text;
+    offsetpos = 0;
+  }
+  while(true) {
+    int textwidth = font.textWidth(_visibletext);
+    if(textwidth > w - BORDER - 4 + 3) {
+      if(walkstate == WALK_LEFT) {
+        _visibletext = _visibletext.substr(0, _visibletext.length()-1);
+      }
+      else if(walkstate == WALK_RIGHT) {
+        _visibletext = _visibletext.substr(0, _visibletext.length()-1);
+      }
+      else {
+        if(offsetpos < pos) {
+          _visibletext = _visibletext.substr(1);
+          offsetpos++;
+        }
+        else {
+          _visibletext = _visibletext.substr(0, _visibletext.length() - 1);
+        }
+      }
+    }
+    else {
+      DEBUG(lienedit, "Full text:              '%s'\n", _text.c_str());
+      DEBUG(lineedit, "Drawing text in lineedit '%s'\n", _visibletext.c_str());
+      DEBUG(lineedit, "Offset, pos: %d, %d\n", offsetpos, pos);
+      break;
+    }
+  }
+
+  walkstate = NOOP;
+
+  p.drawText(BORDER - 4 + 3, height()/2+5 + 1 + 1 + 1, font, _visibletext);
 
   if(readOnly()) return;
 
   if(hasKeyboardFocus()) {
-    size_t px = font.textWidth(_text.substr(0, pos));
+//    size_t px = font.textWidth(_text.substr(0, pos - offsetpos));
+    size_t px = font.textWidth(_visibletext.substr(0, pos - offsetpos));
     //p.setColour(Colour(0.8));
     p.drawLine(px + BORDER - 1 - 4 + 3, 6,
                px + BORDER - 1 - 4 + 3, height() - 7);
   }
-
-  DEBUG(lineedit, "Weeeh!\n");
 }
 
 #ifdef TEST_LINEEDIT
diff --git a/plugingui/lineedit.h b/plugingui/lineedit.h
index 2c37522..f85e9bd 100644
--- a/plugingui/lineedit.h
+++ b/plugingui/lineedit.h
@@ -65,6 +65,15 @@ private:
 
   std::string _text;
   size_t pos;
+  std::string _visibletext;
+  size_t offsetpos;
+
+  enum state_t {
+    NOOP = 0,
+    WALK_LEFT =  1, 
+    WALK_RIGHT = 2
+  };
+  state_t walkstate;
 
   bool readonly;
 
-- 
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