From e6e5fa3bf8853f149fdef16b39af3981097176a4 Mon Sep 17 00:00:00 2001
From: adrido <robots_only_adrido@gmx.com>
Date: Mon, 9 Oct 2017 06:57:18 +0200
Subject: Formspec: textarea with scrollbar improvements

Increase scrollrate depending on fontsize

Scroll on mousewheel

Allow scrolling and marking text on non writable textareas

Update lua api about readonly mode

Show scrollbar if text overflows
---
 src/intlGUIEditBox.cpp | 37 +++++++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 10 deletions(-)

(limited to 'src/intlGUIEditBox.cpp')

diff --git a/src/intlGUIEditBox.cpp b/src/intlGUIEditBox.cpp
index a6175231f..ab470c4fc 100644
--- a/src/intlGUIEditBox.cpp
+++ b/src/intlGUIEditBox.cpp
@@ -260,7 +260,7 @@ void intlGUIEditBox::setTextAlignment(EGUI_ALIGNMENT horizontal, EGUI_ALIGNMENT
 //! called if an event happened.
 bool intlGUIEditBox::OnEvent(const SEvent& event)
 {
-	if (IsEnabled && m_writable)
+	if (IsEnabled)
 	{
 
 		switch(event.EventType)
@@ -780,7 +780,7 @@ void intlGUIEditBox::draw()
 
 	if (Border)
 	{
-		if (m_writable)	{
+		if (m_writable) {
 			skin->draw3DSunkenPane(this, skin->getColor(EGDC_WINDOW),
 				false, true, FrameRect, &AbsoluteClippingRect);
 		}
@@ -944,8 +944,7 @@ void intlGUIEditBox::draw()
 			font->getKerningWidth(L"_", CursorPos-startPos > 0 ? &((*txtLine)[CursorPos-startPos-1]) : 0);
 
 		if (m_writable)	{
-			if (focus && (porting::getTimeMs() - BlinkStartTime) % 700 < 350)
-			{
+			if (focus && (porting::getTimeMs() - BlinkStartTime) % 700 < 350) {
 				setTextRect(cursorLine);
 				CurrentTextRect.UpperLeftCorner.X += charcursorpos;
 
@@ -1086,6 +1085,14 @@ bool intlGUIEditBox::processMouse(const SEvent& event)
 			calculateScrollPos();
 			return true;
 		}
+		break;
+	case EMIE_MOUSE_WHEEL:
+		if (m_vscrollbar) {
+			s32 pos = m_vscrollbar->getPos();
+			s32 step = m_vscrollbar->getSmallStep();
+			m_vscrollbar->setPos(pos - event.MouseInput.Wheel * step);
+		}
+		break;
 	default:
 		break;
 	}
@@ -1433,9 +1440,8 @@ void intlGUIEditBox::calculateScrollPos()
 		VScrollPos = 0;
 
 	// todo: adjust scrollbar
-	if (m_vscrollbar) {
+	if (m_vscrollbar)
 		m_vscrollbar->setPos(VScrollPos);
-	}	
 }
 
 //! set text markers
@@ -1467,20 +1473,31 @@ void intlGUIEditBox::sendGuiEvent(EGUI_EVENT_TYPE type)
 //! Create a vertical scrollbar
 void intlGUIEditBox::createVScrollBar()
 {
+	s32 fontHeight = 1;
+
+	if (OverrideFont) {
+		fontHeight = OverrideFont->getDimension(L"").Height;
+	} else {
+		if (IGUISkin* skin = Environment->getSkin()) {
+			if (IGUIFont* font = skin->getFont()) {
+				fontHeight = font->getDimension(L"").Height;
+			}
+		}
+	}
+
 	irr::core::rect<s32> scrollbarrect = FrameRect;
 	scrollbarrect.UpperLeftCorner.X += FrameRect.getWidth() - m_scrollbar_width;
 	m_vscrollbar = Environment->addScrollBar(false, scrollbarrect, getParent(), getID());
 	m_vscrollbar->setVisible(false);
-	m_vscrollbar->setSmallStep(1);
-	m_vscrollbar->setLargeStep(1);
+	m_vscrollbar->setSmallStep(3 * fontHeight);
+	m_vscrollbar->setLargeStep(10 * fontHeight);
 }
 
 //! Update the vertical scrollbar (visibilty & scroll position)
 void intlGUIEditBox::updateVScrollBar()
 {
-	if (!m_vscrollbar) {
+	if (!m_vscrollbar)
 		return;
-	}
 
 	// OnScrollBarChanged(...)
 	if (m_vscrollbar->getPos() != VScrollPos) {
-- 
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