Fix issue. Elide a variable description in the formula wizard.

(cherry picked from commit 56ec62580c)

ChangeLog.txt

@@ -85,6 +85,7 @@
 - Fix dialog for tool Point along perpendicular. No memory of line color settings. 
 - Fix crash after uniting three pieces in sequence.
 - Incorrect conversion to newer curve format.
+- Elide a variable description in the formula wizard.
 
 # Version 0.6.1 October 23, 2018
 - [#885] Regression. Broken support for multi size measurements.

src/libs/vtools/dialogs/support/dialogeditwrongformula.ui

@@ -9,8 +9,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>448</width>
+    <width>542</width>
-    <height>478</height>
+    <height>481</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -23,7 +23,7 @@
   <property name="modal">
    <bool>true</bool>
   </property>
-  <layout class="QVBoxLayout" name="verticalLayout_4">
+  <layout class="QVBoxLayout" name="verticalLayout_5">
    <item>
     <layout class="QHBoxLayout" name="horizontalLayout_2">
      <item alignment="Qt::AlignLeft">
@@ -172,6 +172,8 @@
       </property>
      </widget>
      <widget class="QWidget" name="">
+      <layout class="QVBoxLayout" name="verticalLayout_4" stretch="3,1">
+       <item>
         <layout class="QHBoxLayout" name="horizontalLayout_3">
          <item>
           <layout class="QVBoxLayout" name="verticalLayout_2">
@@ -369,17 +371,25 @@
           </layout>
          </item>
         </layout>
-     </widget>
-    </widget>
        </item>
        <item>
-    <widget class="QLabel" name="labelDescription">
+        <widget class="VElidedLabel" name="labelDescription">
-     <property name="text">
+         <property name="sizePolicy">
-      <string/>
+          <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
          </property>
-     <property name="wordWrap">
+         <property name="frameShape">
-      <bool>true</bool>
+          <enum>QFrame::NoFrame</enum>
          </property>
+         <property name="frameShadow">
+          <enum>QFrame::Raised</enum>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
     </widget>
    </item>
    <item>
@@ -400,6 +410,12 @@
    <extends>QPlainTextEdit</extends>
    <header location="global">vplaintextedit.h</header>
   </customwidget>
+  <customwidget>
+   <class>VElidedLabel</class>
+   <extends>QFrame</extends>
+   <header location="global">velidedlabel.h</header>
+   <container>1</container>
+  </customwidget>
  </customwidgets>
  <tabstops>
   <tabstop>toolButtonPutHere</tabstop>

src/libs/vwidgets/velidedlabel.cpp

@@ -0,0 +1,151 @@
+/************************************************************************
+ **
+ **  @file   velidedlabel.cpp
+ **  @author Roman Telezhynskyi <dismine(at)gmail.com>
+ **  @date   8 5, 2020
+ **
+ **  @brief
+ **  @copyright
+ **  This source code is part of the Valentina project, a pattern making
+ **  program, whose allow create and modeling patterns of clothing.
+ **  Copyright (C) 2020 Valentina project
+ **  <https://gitlab.com/smart-pattern/valentina> All Rights Reserved.
+ **
+ **  Valentina is free software: you can redistribute it and/or modify
+ **  it under the terms of the GNU General Public License as published by
+ **  the Free Software Foundation, either version 3 of the License, or
+ **  (at your option) any later version.
+ **
+ **  Valentina is distributed in the hope that it will be useful,
+ **  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ **  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ **  GNU General Public License for more details.
+ **
+ **  You should have received a copy of the GNU General Public License
+ **  along with Valentina.  If not, see <http://www.gnu.org/licenses/>.
+ **
+ *************************************************************************/
+#include "velidedlabel.h"
+
+#include <QPainter>
+#include <QTextLayout>
+
+//---------------------------------------------------------------------------------------------------------------------
+VElidedLabel::VElidedLabel(QWidget *parent)
+    : QFrame(parent)
+{
+    // reserve size for one line of text
+    setMinimumHeight(fontMetrics().lineSpacing());
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+VElidedLabel::VElidedLabel(const QString &text, QWidget *parent)
+    : QFrame(parent),
+      m_content(text)
+{
+    // reserve size for one line of text
+    setMinimumHeight(fontMetrics().lineSpacing());
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+void VElidedLabel::setText(const QString &text)
+{
+    m_content = text;
+    update();
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+void VElidedLabel::paintEvent(QPaintEvent *event)
+{
+    QFrame::paintEvent(event);
+
+    QPainter painter(this);
+    bool didElide = false;
+    int y = 0;
+
+    // QTextLayout works with paragraphs
+    QStringList paragraphs = m_content.split('\n');
+    for (int i = 0; i < paragraphs.size(); ++i)
+    {
+        if (not DrawParagraph(painter, paragraphs.at(i), y, didElide))
+        {
+            // It text has empty strings a user will not see elided string, but we still want to show a tooltip.
+            if (i != paragraphs.size()-1 && !didElide)
+            {
+                didElide = true;
+            }
+            break;
+        }
+    }
+
+    if (didElide != m_elided)
+    {
+        m_elided = didElide;
+
+        if (m_showElided)
+        {
+            if (m_elided)
+            {
+                // Show a tooltip in case we cannot show a whole text in the widget
+                // Use dumb html tag to separate paragraphs.
+                QString toolTip;
+                for(int i = 0; i < paragraphs.size(); ++i)
+                {
+                    if (i != 0)
+                    {
+                        toolTip.append(QString("<br>"));
+                    }
+                    toolTip.append(QString("<font>%1</font>").arg(paragraphs.at(i)));
+                }
+                setToolTip(toolTip);
+            }
+            else
+            {
+                setToolTip(QString());
+            }
+        }
+        emit ElisionChanged(didElide);
+    }
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+bool VElidedLabel::DrawParagraph(QPainter &painter, const QString& paragraph, int &y, bool &didElide)
+{
+    QFontMetrics fontMetrics = painter.fontMetrics();
+
+    int lineSpacing = fontMetrics.lineSpacing();
+    bool ok = true;
+
+    QTextLayout textLayout(paragraph, painter.font());
+    textLayout.beginLayout();
+    forever
+    {
+        QTextLine line = textLayout.createLine();
+
+        if (!line.isValid())
+        {
+            break;
+        }
+
+        line.setLineWidth(width());
+        int nextLineY = y + lineSpacing;
+
+        if (height() >= nextLineY + lineSpacing)
+        {
+            line.draw(&painter, QPoint(0, y));
+            y = nextLineY;
+        }
+        else
+        {
+            QString lastLine = paragraph.mid(line.textStart());
+            QString elidedLastLine = fontMetrics.elidedText(lastLine, Qt::ElideRight, width());
+            painter.drawText(QPoint(0, y + fontMetrics.ascent()), elidedLastLine);
+            y = nextLineY;
+            ok = false;
+            didElide = lastLine != elidedLastLine;
+            break;
+        }
+    }
+    textLayout.endLayout();
+    return ok;
+}

src/libs/vwidgets/velidedlabel.h

@@ -0,0 +1,90 @@
+/************************************************************************
+ **
+ **  @file   velidedlabel.h
+ **  @author Roman Telezhynskyi <dismine(at)gmail.com>
+ **  @date   8 5, 2020
+ **
+ **  @brief
+ **  @copyright
+ **  This source code is part of the Valentina project, a pattern making
+ **  program, whose allow create and modeling patterns of clothing.
+ **  Copyright (C) 2020 Valentina project
+ **  <https://gitlab.com/smart-pattern/valentina> All Rights Reserved.
+ **
+ **  Valentina is free software: you can redistribute it and/or modify
+ **  it under the terms of the GNU General Public License as published by
+ **  the Free Software Foundation, either version 3 of the License, or
+ **  (at your option) any later version.
+ **
+ **  Valentina is distributed in the hope that it will be useful,
+ **  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ **  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ **  GNU General Public License for more details.
+ **
+ **  You should have received a copy of the GNU General Public License
+ **  along with Valentina.  If not, see <http://www.gnu.org/licenses/>.
+ **
+ *************************************************************************/
+#ifndef VELIDEDLABEL_H
+#define VELIDEDLABEL_H
+
+#include <QFrame>
+
+class VElidedLabel : public QFrame
+{
+    Q_OBJECT
+    Q_PROPERTY(QString text READ text WRITE setText)
+    Q_PROPERTY(bool IsElided READ IsElided)
+    Q_PROPERTY(bool showElided READ ShowElided WRITE SetShowElided)
+public:
+   explicit VElidedLabel(QWidget *parent = nullptr);
+   explicit VElidedLabel(const QString &text, QWidget *parent = nullptr);
+
+   void           setText(const QString &text);
+   const QString& text() const;
+
+   bool IsElided() const;
+
+   bool ShowElided() const;
+   void SetShowElided(bool showElided);
+
+protected:
+   virtual void paintEvent(QPaintEvent *event) override;
+
+signals:
+   void ElisionChanged(bool m_elided);
+
+private:
+   Q_DISABLE_COPY(VElidedLabel)
+   bool    m_elided{false};
+   bool    m_showElided{true};
+   QString m_content{};
+
+   bool DrawParagraph(QPainter &painter, const QString& paragraph, int &y, bool &didElide);
+};
+
+//---------------------------------------------------------------------------------------------------------------------
+inline const QString &VElidedLabel::text() const
+{
+    return m_content;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+inline bool VElidedLabel::IsElided() const
+{
+    return m_elided;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+inline bool VElidedLabel::ShowElided() const
+{
+    return m_showElided;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+inline void VElidedLabel::SetShowElided(bool showElided)
+{
+    m_showElided = showElided;
+}
+
+#endif // VELIDEDLABEL_H

src/libs/vwidgets/vwidgets.pri

@@ -3,6 +3,7 @@
 
 SOURCES += \
     $$PWD/vcomboboxdelegate.cpp \
+    $$PWD/velidedlabel.cpp \
     $$PWD/vmaingraphicsscene.cpp \
     $$PWD/vmaingraphicsview.cpp \
     $$PWD/vwidgetpopup.cpp \
@@ -32,6 +33,7 @@ SOURCES += \
 HEADERS += \
     $$PWD/stable.h \
     $$PWD/vcomboboxdelegate.h \
+    $$PWD/velidedlabel.h \
     $$PWD/vmaingraphicsscene.h \
     $$PWD/vmaingraphicsview.h \
     $$PWD/vwidgetpopup.h \