JUCE/src/juce_appframework/gui/components/controls/juce_TableHeaderComponent.cpp

/*
  ==============================================================================

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-7 by Raw Material Software ltd.

  ------------------------------------------------------------------------------

   JUCE can be redistributed and/or modified under the terms of the
   GNU General Public License, as published by the Free Software Foundation;
   either version 2 of the License, or (at your option) any later version.

   JUCE 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 JUCE; if not, visit www.gnu.org/licenses or write to the
   Free Software Foundation, Inc., 59 Temple Place, Suite 330,
   Boston, MA 02111-1307 USA

  ------------------------------------------------------------------------------

   If you'd like to release a closed-source product which uses JUCE, commercial
   licenses are also available: visit www.rawmaterialsoftware.com/juce for
   more information.

  ==============================================================================
*/

#include "../../../../juce_core/basics/juce_StandardHeader.h"

BEGIN_JUCE_NAMESPACE

#include "juce_TableHeaderComponent.h"
#include "../../graphics/imaging/juce_Image.h"
#include "../../graphics/brushes/juce_GradientBrush.h"
#include "../../../../juce_core/text/juce_XmlDocument.h"
#include "../lookandfeel/juce_LookAndFeel.h"
#include "../layout/juce_StretchableObjectResizer.h"


//==============================================================================
class DragOverlayComp   : public Component
{
public:
    DragOverlayComp (Image* const image_)
        : image (image_)
    {
        image->multiplyAllAlphas (0.8f);
        setAlwaysOnTop (true);
    }

    ~DragOverlayComp()
    {
        delete image;
    }

    void paint (Graphics& g)
    {
        g.drawImageAt (image, 0, 0);
    }

private:
    Image* image;

    DragOverlayComp (const DragOverlayComp&);
    const DragOverlayComp& operator= (const DragOverlayComp&);
};


//==============================================================================
TableHeaderComponent::TableHeaderComponent()
    : listeners (2),
      dragOverlayComp (0),
      columnsChanged (false),
      columnsResized (false),
      sortChanged (false),
      menuActive (true),
      stretchToFit (false),
      columnIdBeingResized (0),
      columnIdBeingDragged (0),
      columnIdUnderMouse (0),
      lastDeliberateWidth (0)
{
}

TableHeaderComponent::~TableHeaderComponent()
{
    delete dragOverlayComp;
}

//==============================================================================
void TableHeaderComponent::setPopupMenuActive (const bool hasMenu)
{
    menuActive = hasMenu;
}

bool TableHeaderComponent::isPopupMenuActive() const throw()              { return menuActive; }


//==============================================================================
int TableHeaderComponent::getNumColumns (const bool onlyCountVisibleColumns) const throw()
{
    if (onlyCountVisibleColumns)
    {
        int num = 0;

        for (int i = columns.size(); --i >= 0;)
            if (columns.getUnchecked(i)->isVisible())
                ++num;

        return num;
    }
    else
    {
        return columns.size();
    }
}

const String TableHeaderComponent::getColumnName (const int columnId) const throw()
{
    const ColumnInfo* const ci = getInfoForId (columnId);
    return ci != 0 ? ci->name : String::empty;
}

void TableHeaderComponent::setColumnName (const int columnId, const String& newName)
{
    ColumnInfo* const ci = getInfoForId (columnId);

    if (ci != 0 && ci->name != newName)
    {
        ci->name = newName;
        sendColumnsChanged();
    }
}

void TableHeaderComponent::addColumn (const String& columnName,
                                      const int columnId,
                                      const int width,
                                      const int minimumWidth,
                                      const int maximumWidth,
                                      const int propertyFlags,
                                      const int insertIndex)
{
    // can't have a duplicate or null ID!
    jassert (columnId != 0 && getIndexOfColumnId (columnId, false) < 0);
    jassert (width > 0);

    ColumnInfo* const ci = new ColumnInfo();
    ci->name = columnName;
    ci->id = columnId;
    ci->width = width;
    ci->lastDeliberateWidth = width;
    ci->minimumWidth = minimumWidth;
    ci->maximumWidth = maximumWidth;
    if (ci->maximumWidth < 0)
        ci->maximumWidth = INT_MAX;
    jassert (ci->maximumWidth >= ci->minimumWidth);
    ci->propertyFlags = propertyFlags;

    columns.insert (insertIndex, ci);
    sendColumnsChanged();
}

void TableHeaderComponent::removeColumn (const int columnIdToRemove)
{
    const int index = getIndexOfColumnId (columnIdToRemove, false);

    if (index >= 0)
    {
        columns.remove (index);
        sortChanged = true;
        sendColumnsChanged();
    }
}

void TableHeaderComponent::removeAllColumns()
{
    if (columns.size() > 0)
    {
        columns.clear();
        sendColumnsChanged();
    }
}

void TableHeaderComponent::moveColumn (const int columnId, int newIndex)
{
    const int currentIndex = getIndexOfColumnId (columnId, false);
    newIndex = visibleIndexToTotalIndex (newIndex);

    if (columns [currentIndex] != 0 && currentIndex != newIndex)
    {
        columns.move (currentIndex, newIndex);
        sendColumnsChanged();
    }
}

void TableHeaderComponent::setColumnWidth (const int columnId, const int newWidth)
{
    ColumnInfo* const ci = getInfoForId (columnId);

    if (ci != 0 && ci->width != newWidth)
    {
        const int numColumns = getNumColumns (true);

        ci->lastDeliberateWidth = ci->width
            = jlimit (ci->minimumWidth, ci->maximumWidth, newWidth);

        if (stretchToFit)
        {
            const int index = getIndexOfColumnId (columnId, true) + 1;

            if (((unsigned int) index) < (unsigned int) numColumns)
            {
                const int x = getColumnPosition (index).getX();

                if (lastDeliberateWidth == 0)
                    lastDeliberateWidth = getTotalWidth();

                resizeColumnsToFit (visibleIndexToTotalIndex (index), lastDeliberateWidth - x);
            }
        }

        repaint();
        columnsResized = true;
        triggerAsyncUpdate();
    }
}

//==============================================================================
int TableHeaderComponent::getIndexOfColumnId (const int id, const bool onlyCountVisibleColumns) const throw()
{
    int n = 0;

    for (int i = 0; i < columns.size(); ++i)
    {
        if ((! onlyCountVisibleColumns) || columns.getUnchecked(i)->isVisible())
        {
            if (columns.getUnchecked(i)->id == id)
                return n;

            ++n;
        }
    }

    return -1;
}

int TableHeaderComponent::getColumnIdOfIndex (int index, const bool onlyCountVisibleColumns) const throw()
{
    if (onlyCountVisibleColumns)
        index = visibleIndexToTotalIndex (index);

    const ColumnInfo* const ci = columns [index];
    return (ci != 0) ? ci->id : 0;
}

const Rectangle TableHeaderComponent::getColumnPosition (const int index) const throw()
{
    int x = 0, width = 0, n = 0;

    for (int i = 0; i < columns.size(); ++i)
    {
        x += width;

        if (columns.getUnchecked(i)->isVisible())
        {
            width = columns.getUnchecked(i)->width;

            if (n++ == index)
                break;
        }
        else
        {
            width = 0;
        }
    }

    return Rectangle (x, 0, width, getHeight());
}

int TableHeaderComponent::getColumnIdAtX (const int xToFind) const throw()
{
    if (xToFind >= 0)
    {
        int x = 0;

        for (int i = 0; i < columns.size(); ++i)
        {
            const ColumnInfo* const ci = columns.getUnchecked(i);

            if (ci->isVisible())
            {
                x += ci->width;

                if (xToFind < x)
                    return ci->id;
            }
        }
    }

    return 0;
}

int TableHeaderComponent::getTotalWidth() const throw()
{
    int w = 0;

    for (int i = columns.size(); --i >= 0;)
        if (columns.getUnchecked(i)->isVisible())
            w += columns.getUnchecked(i)->width;

    return w;
}

void TableHeaderComponent::setStretchToFitActive (const bool shouldStretchToFit)
{
    stretchToFit = shouldStretchToFit;
    lastDeliberateWidth = getTotalWidth();
    resized();
}

bool TableHeaderComponent::isStretchToFitActive() const throw()
{
    return stretchToFit;
}

void TableHeaderComponent::resizeAllColumnsToFit (int targetTotalWidth)
{
    if (stretchToFit && getWidth() > 0
         && columnIdBeingResized == 0 && columnIdBeingDragged == 0)
    {
        lastDeliberateWidth = targetTotalWidth;
        resizeColumnsToFit (0, targetTotalWidth);
    }
}

void TableHeaderComponent::resizeColumnsToFit (int firstColumnIndex, int targetTotalWidth)
{
    targetTotalWidth = jmax (targetTotalWidth, 0);

    StretchableObjectResizer sor;
    int i;
    for (i = firstColumnIndex; i < columns.size(); ++i)
    {
        ColumnInfo* const ci = columns.getUnchecked(i);

        if (ci->isVisible())
            sor.addItem (ci->lastDeliberateWidth, ci->minimumWidth, ci->maximumWidth);
    }

    sor.resizeToFit (targetTotalWidth);

    int visIndex = 0;
    for (i = firstColumnIndex; i < columns.size(); ++i)
    {
        ColumnInfo* const ci = columns.getUnchecked(i);

        if (ci->isVisible())
        {
            const int newWidth = jlimit (ci->minimumWidth, ci->maximumWidth,
                                         (int) floor (sor.getItemSize (visIndex++)));

            if (newWidth != ci->width)
            {
                ci->width = newWidth;
                repaint();
                columnsResized = true;
                triggerAsyncUpdate();
            }
        }
    }
}

void TableHeaderComponent::setColumnVisible (const int columnId, const bool shouldBeVisible)
{
    ColumnInfo* const ci = getInfoForId (columnId);

    if (ci != 0 && shouldBeVisible != ci->isVisible())
    {
        if (shouldBeVisible)
            ci->propertyFlags |= visible;
        else
            ci->propertyFlags &= ~visible;

        sendColumnsChanged();
        resized();
    }
}

bool TableHeaderComponent::isColumnVisible (const int columnId) const
{
    const ColumnInfo* const ci = getInfoForId (columnId);
    return ci != 0 && ci->isVisible();
}

//==============================================================================
void TableHeaderComponent::setSortColumnId (const int columnId, const bool sortForwards)
{
    if (getSortColumnId() != columnId || isSortedForwards() != sortForwards)
    {
        for (int i = columns.size(); --i >= 0;)
            columns.getUnchecked(i)->propertyFlags &= ~(sortedForwards | sortedBackwards);

        ColumnInfo* const ci = getInfoForId (columnId);

        if (ci != 0)
            ci->propertyFlags |= (sortForwards ? sortedForwards : sortedBackwards);

        sortChanged = true;
        repaint();
        triggerAsyncUpdate();
    }
}

int TableHeaderComponent::getSortColumnId() const throw()
{
    for (int i = columns.size(); --i >= 0;)
        if ((columns.getUnchecked(i)->propertyFlags & (sortedForwards | sortedBackwards)) != 0)
            return columns.getUnchecked(i)->id;

    return 0;
}

bool TableHeaderComponent::isSortedForwards() const throw()
{
    for (int i = columns.size(); --i >= 0;)
        if ((columns.getUnchecked(i)->propertyFlags & (sortedForwards | sortedBackwards)) != 0)
            return (columns.getUnchecked(i)->propertyFlags & sortedForwards) != 0;

    return true;
}

//==============================================================================
const String TableHeaderComponent::toString() const
{
    String s;

    XmlElement doc (T("TABLELAYOUT"));

    doc.setAttribute (T("sortedCol"), getSortColumnId());
    doc.setAttribute (T("sortForwards"), isSortedForwards());

    for (int i = 0; i < columns.size(); ++i)
    {
        const ColumnInfo* const ci = columns.getUnchecked (i);

        XmlElement* const e = new XmlElement (T("COLUMN"));
        doc.addChildElement (e);

        e->setAttribute (T("id"), ci->id);
        e->setAttribute (T("visible"), ci->isVisible());
        e->setAttribute (T("width"), ci->width);
    }

    return doc.createDocument (String::empty, true, false);
}

void TableHeaderComponent::restoreFromString (const String& storedVersion)
{
    XmlDocument doc (storedVersion);
    XmlElement* const storedXml = doc.getDocumentElement();

    int index = 0;

    if (storedXml != 0 && storedXml->hasTagName (T("TABLELAYOUT")))
    {
        forEachXmlChildElement (*storedXml, col)
        {
            const int id = col->getIntAttribute (T("id"));

            ColumnInfo* const ci = getInfoForId (id);

            if (ci != 0)
            {
                columns.move (columns.indexOf (ci), index);
                ci->width = col->getIntAttribute (T("width"));
                setColumnVisible (id, col->getBoolAttribute (T("visible")));
            }

            ++index;
        }

        columnsResized = true;
        sendColumnsChanged();

        setSortColumnId (storedXml->getIntAttribute (T("sortedCol")),
                         storedXml->getBoolAttribute (T("sortForwards"), true));
    }

    delete storedXml;
}

//==============================================================================
void TableHeaderComponent::addListener (TableHeaderListener* const newListener) throw()
{
    listeners.addIfNotAlreadyThere (newListener);
}

void TableHeaderComponent::removeListener (TableHeaderListener* const listenerToRemove) throw()
{
    listeners.removeValue (listenerToRemove);
}

//==============================================================================
void TableHeaderComponent::columnClicked (int columnId, const ModifierKeys& mods)
{
    const ColumnInfo* const ci = getInfoForId (columnId);

    if (ci != 0 && (ci->propertyFlags & sortable) != 0 && ! mods.isPopupMenu())
        setSortColumnId (columnId, (ci->propertyFlags & sortedForwards) == 0);
}

void TableHeaderComponent::addMenuItems (PopupMenu& menu, const int /*columnIdClicked*/)
{
    for (int i = 0; i < columns.size(); ++i)
    {
        const ColumnInfo* const ci = columns.getUnchecked(i);

        if ((ci->propertyFlags & appearsOnColumnMenu) != 0)
            menu.addItem (ci->id, ci->name,
                          (ci->propertyFlags & (sortedForwards | sortedBackwards)) == 0,
                          isColumnVisible (ci->id));
    }
}

void TableHeaderComponent::reactToMenuItem (const int menuReturnId, const int /*columnIdClicked*/)
{
    if (getIndexOfColumnId (menuReturnId, false) >= 0)
        setColumnVisible (menuReturnId, ! isColumnVisible (menuReturnId));
}

void TableHeaderComponent::paint (Graphics& g)
{
    LookAndFeel& lf = getLookAndFeel();

    lf.drawTableHeaderBackground (g, *this);

    const Rectangle clip (g.getClipBounds());

    int x = 0;
    for (int i = 0; i < columns.size(); ++i)
    {
        const ColumnInfo* const ci = columns.getUnchecked(i);

        if (ci->isVisible())
        {
            if (x + ci->width > clip.getX()
                 && (ci->id != columnIdBeingDragged
                      || dragOverlayComp == 0
                      || ! dragOverlayComp->isVisible()))
            {
                g.saveState();
                g.setOrigin (x, 0);
                g.reduceClipRegion (0, 0, ci->width, getHeight());

                lf.drawTableHeaderColumn (g, ci->name, ci->id, ci->width, getHeight(),
                                          ci->id == columnIdUnderMouse,
                                          ci->id == columnIdUnderMouse && isMouseButtonDown(),
                                          ci->propertyFlags);

                g.restoreState();
            }

            x += ci->width;

            if (x >= clip.getRight())
                break;
        }
    }
}

void TableHeaderComponent::resized()
{
}

void TableHeaderComponent::mouseMove (const MouseEvent& e)
{
    updateColumnUnderMouse (e.x, e.y);
}

void TableHeaderComponent::mouseEnter (const MouseEvent& e)
{
    updateColumnUnderMouse (e.x, e.y);
}

void TableHeaderComponent::mouseExit (const MouseEvent& e)
{
    updateColumnUnderMouse (e.x, e.y);
}

void TableHeaderComponent::mouseDown (const MouseEvent& e)
{
    repaint();
    columnIdBeingResized = 0;
    columnIdBeingDragged = 0;

    if (columnIdUnderMouse != 0)
    {
        draggingColumnOffset = e.x - getColumnPosition (getIndexOfColumnId (columnIdUnderMouse, true)).getX();

        if (e.mods.isPopupMenu())
            columnClicked (columnIdUnderMouse, e.mods);
    }

    if (menuActive && e.mods.isPopupMenu())
        showColumnChooserMenu (columnIdUnderMouse);
}

void TableHeaderComponent::mouseDrag (const MouseEvent& e)
{
    if (columnIdBeingResized == 0
         && columnIdBeingDragged == 0
         && ! (e.mouseWasClicked() || e.mods.isPopupMenu()))
    {
        deleteAndZero (dragOverlayComp);

        columnIdBeingResized = getResizeDraggerAt (e.getMouseDownX());

        if (columnIdBeingResized != 0)
        {
            const ColumnInfo* const ci = getInfoForId (columnIdBeingResized);
            initialColumnWidth = ci->width;
        }
        else
        {
            beginDrag (e);
        }
    }

    if (columnIdBeingResized != 0)
    {
        const ColumnInfo* const ci = getInfoForId (columnIdBeingResized);

        if (ci != 0)
        {
            int w = jlimit (ci->minimumWidth, ci->maximumWidth,
                            initialColumnWidth + e.getDistanceFromDragStartX());

            if (stretchToFit)
            {
                // prevent us dragging a column too far right if we're in stretch-to-fit mode
                int minWidthOnRight = 0;
                for (int i = getIndexOfColumnId (columnIdBeingResized, false) + 1; i < columns.size(); ++i)
                    if (columns.getUnchecked (i)->isVisible())
                        minWidthOnRight += columns.getUnchecked (i)->minimumWidth;

                const Rectangle currentPos (getColumnPosition (getIndexOfColumnId (columnIdBeingResized, true)));
                w = jmax (ci->minimumWidth, jmin (w, getWidth() - minWidthOnRight - currentPos.getX()));
            }

            setColumnWidth (columnIdBeingResized, w);
        }
    }
    else if (columnIdBeingDragged != 0)
    {
        if (e.y >= -50 && e.y < getHeight() + 50)
        {
            beginDrag (e);

            if (dragOverlayComp != 0)
            {
                dragOverlayComp->setVisible (true);
                dragOverlayComp->setBounds (jlimit (0,
                                                    jmax (0, getTotalWidth() - dragOverlayComp->getWidth()),
                                                    e.x - draggingColumnOffset),
                                            0,
                                            dragOverlayComp->getWidth(),
                                            getHeight());

                for (int i = columns.size(); --i >= 0;)
                {
                    const int currentIndex = getIndexOfColumnId (columnIdBeingDragged, true);
                    int newIndex = currentIndex;

                    if (newIndex > 0)
                    {
                        const int leftOfPrevious = getColumnPosition (newIndex - 1).getX();
                        const int rightOfCurrent = getColumnPosition (newIndex).getRight();

                        if (abs (dragOverlayComp->getX() - leftOfPrevious)
                             < abs (dragOverlayComp->getRight() - rightOfCurrent))
                        {
                            --newIndex;
                        }
                    }

                    if (newIndex < columns.size() - 1)
                    {
                        const int leftOfCurrent = getColumnPosition (newIndex).getX();
                        const int rightOfNext = getColumnPosition (newIndex + 1).getRight();

                        if (abs (dragOverlayComp->getX() - leftOfCurrent)
                             > abs (dragOverlayComp->getRight() - rightOfNext))
                        {
                            ++newIndex;
                        }
                    }

                    if (newIndex != currentIndex)
                        moveColumn (columnIdBeingDragged, newIndex);
                    else
                        break;
                }
            }
        }
        else
        {
            endDrag (draggingColumnOriginalIndex);
        }
    }
}

void TableHeaderComponent::beginDrag (const MouseEvent& e)
{
    if (columnIdBeingDragged == 0)
    {
        columnIdBeingDragged = getColumnIdAtX (e.getMouseDownX());

        const ColumnInfo* const ci = getInfoForId (columnIdBeingDragged);

        if (ci == 0 || (ci->propertyFlags & draggable) == 0)
        {
            columnIdBeingDragged = 0;
        }
        else
        {
            draggingColumnOriginalIndex = getIndexOfColumnId (columnIdBeingDragged, true);

            const Rectangle columnRect (getColumnPosition (draggingColumnOriginalIndex));

            const int temp = columnIdBeingDragged;
            columnIdBeingDragged = 0;

            addAndMakeVisible (dragOverlayComp = new DragOverlayComp (createComponentSnapshot (columnRect, false)));
            columnIdBeingDragged = temp;

            dragOverlayComp->setBounds (columnRect);

            for (int i = listeners.size(); --i >= 0;)
            {
                listeners.getUnchecked(i)->tableColumnDraggingChanged (this, columnIdBeingDragged);
                i = jmin (i, listeners.size() - 1);
            }
        }
    }
}

void TableHeaderComponent::endDrag (const int finalIndex)
{
    if (columnIdBeingDragged != 0)
    {
        moveColumn (columnIdBeingDragged, finalIndex);

        columnIdBeingDragged = 0;
        repaint();

        for (int i = listeners.size(); --i >= 0;)
        {
            listeners.getUnchecked(i)->tableColumnDraggingChanged (this, 0);
            i = jmin (i, listeners.size() - 1);
        }
    }
}

void TableHeaderComponent::mouseUp (const MouseEvent& e)
{
    mouseDrag (e);

    for (int i = columns.size(); --i >= 0;)
        if (columns.getUnchecked (i)->isVisible())
            columns.getUnchecked (i)->lastDeliberateWidth = columns.getUnchecked (i)->width;

    columnIdBeingResized = 0;
    repaint();

    endDrag (getIndexOfColumnId (columnIdBeingDragged, true));

    updateColumnUnderMouse (e.x, e.y);

    if (columnIdUnderMouse != 0 && e.mouseWasClicked() && ! e.mods.isPopupMenu())
        columnClicked (columnIdUnderMouse, e.mods);

    deleteAndZero (dragOverlayComp);
}

const MouseCursor TableHeaderComponent::getMouseCursor()
{
    int x, y;
    getMouseXYRelative (x, y);

    if (columnIdBeingResized != 0 || (getResizeDraggerAt (x) != 0 && ! isMouseButtonDown()))
        return MouseCursor (MouseCursor::LeftRightResizeCursor);

    return Component::getMouseCursor();
}

//==============================================================================
bool TableHeaderComponent::ColumnInfo::isVisible() const throw()
{
    return (propertyFlags & TableHeaderComponent::visible) != 0;
}

TableHeaderComponent::ColumnInfo* TableHeaderComponent::getInfoForId (const int id) const throw()
{
    for (int i = columns.size(); --i >= 0;)
        if (columns.getUnchecked(i)->id == id)
            return columns.getUnchecked(i);

    return 0;
}

int TableHeaderComponent::visibleIndexToTotalIndex (const int visibleIndex) const throw()
{
    int n = 0;

    for (int i = 0; i < columns.size(); ++i)
    {
        if (columns.getUnchecked(i)->isVisible())
        {
            if (n == visibleIndex)
                return i;

            ++n;
        }
    }

    return -1;
}

void TableHeaderComponent::sendColumnsChanged()
{
    if (stretchToFit && lastDeliberateWidth > 0)
        resizeAllColumnsToFit (lastDeliberateWidth);

    repaint();
    columnsChanged = true;
    triggerAsyncUpdate();
}

void TableHeaderComponent::handleAsyncUpdate()
{
    const bool changed = columnsChanged || sortChanged;
    const bool sized = columnsResized || changed;
    const bool sorted = sortChanged;
    columnsChanged = false;
    columnsResized = false;
    sortChanged = false;

    if (sorted)
    {
        for (int i = listeners.size(); --i >= 0;)
        {
            listeners.getUnchecked(i)->tableSortOrderChanged (this);
            i = jmin (i, listeners.size() - 1);
        }
    }

    if (changed)
    {
        for (int i = listeners.size(); --i >= 0;)
        {
            listeners.getUnchecked(i)->tableColumnsChanged (this);
            i = jmin (i, listeners.size() - 1);
        }
    }

    if (sized)
    {
        for (int i = listeners.size(); --i >= 0;)
        {
            listeners.getUnchecked(i)->tableColumnsResized (this);
            i = jmin (i, listeners.size() - 1);
        }
    }
}

int TableHeaderComponent::getResizeDraggerAt (const int mouseX) const throw()
{
    if (((unsigned int) mouseX) < (unsigned int) getWidth())
    {
        const int draggableDistance = 3;
        int x = 0;

        for (int i = 0; i < columns.size(); ++i)
        {
            const ColumnInfo* const ci = columns.getUnchecked(i);

            if (ci->isVisible())
            {
                if (abs (mouseX - (x + ci->width)) <= draggableDistance
                     && (ci->propertyFlags & resizable) != 0)
                    return ci->id;

                x += ci->width;
            }
        }
    }

    return 0;
}

void TableHeaderComponent::updateColumnUnderMouse (int x, int y)
{
    const int newCol = (reallyContains (x, y, true) && getResizeDraggerAt (x) == 0)
                            ? getColumnIdAtX (x) : 0;

    if (newCol != columnIdUnderMouse)
    {
        columnIdUnderMouse = newCol;
        repaint();
    }
}

void TableHeaderComponent::showColumnChooserMenu (const int columnIdClicked)
{
    PopupMenu m;
    addMenuItems (m, columnIdClicked);

    if (m.getNumItems() > 0)
    {
        const int result = m.show();

        if (result != 0)
            reactToMenuItem (result, columnIdClicked);
    }
}

void TableHeaderListener::tableColumnDraggingChanged (TableHeaderComponent*, int)
{
}


END_JUCE_NAMESPACE