?? tabcontrol.cs
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PageDragStart(this, e);
}
public virtual void OnPageDragMove(MouseEventArgs e)
{
// Has anyone registered for the event?
if (PageDragMove != null)
PageDragMove(this, e);
}
public virtual void OnPageDragEnd(MouseEventArgs e)
{
// Has anyone registered for the event?
if (PageDragEnd != null)
PageDragEnd(this, e);
}
public virtual void OnPageDragQuit(MouseEventArgs e)
{
// Has anyone registered for the event?
if (PageDragQuit != null)
PageDragQuit(this, e);
}
public virtual void OnDoubleClickTab(TabPage page)
{
// Has anyone registered for the event?
if (DoubleClickTab != null)
DoubleClickTab(this, page);
}
protected virtual void OnCloseButton(object sender, EventArgs e)
{
OnClosePressed(EventArgs.Empty);
}
protected virtual void OnLeftArrow(object sender, EventArgs e)
{
// Set starting page back one
_startPage--;
_recalculate = true;
Invalidate();
}
protected virtual void OnRightArrow(object sender, EventArgs e)
{
// Set starting page forward one
_startPage++;
_recalculate = true;
Invalidate();
}
protected virtual void DefineFont(Font newFont)
{
// Use base class for storage of value
base.Font = newFont;
// Update internal height value using Font
_textHeight = newFont.Height;
// Is the font height bigger than the image height?
if (_imageHeight >= _textHeight)
{
// No, do not need extra spacing around the image to fit in text
_imageGapTopExtra = 0;
_imageGapBottomExtra = 0;
}
else
{
// Yes, need to make the image area bigger so that its height calculation
// matchs that height of the text
int extraHeight = _textHeight - _imageHeight;
// Split the extra height between the top and bottom of image
_imageGapTopExtra = extraHeight / 2;
_imageGapBottomExtra = extraHeight - _imageGapTopExtra;
}
}
protected virtual void DefineBackColor(Color newColor)
{
base.BackColor = newColor;
// Calculate the modified colors from this base
_backLight = ControlPaint.Light(newColor);
_backLightLight = ControlPaint.LightLight(newColor);
_backDark = ControlPaint.Dark(newColor);
_backDarkDark = ControlPaint.DarkDark(newColor);
_backIDE = ColorHelper.TabBackgroundFromBaseColor(newColor);
}
protected virtual void DefineButtonImages()
{
ImageAttributes ia = new ImageAttributes();
ColorMap activeMap = new ColorMap();
ColorMap inactiveMap = new ColorMap();
// Define the color transformations needed
activeMap.OldColor = Color.Black;
activeMap.NewColor = _buttonActiveColor;
inactiveMap.OldColor = Color.White;
inactiveMap.NewColor = _buttonInactiveColor;
// Create remap attributes for use by button
ia.SetRemapTable(new ColorMap[]{activeMap, inactiveMap}, ColorAdjustType.Bitmap);
// Pass attributes to the buttons
_leftArrow.ImageAttributes = ia;
_rightArrow.ImageAttributes = ia;
_closeButton.ImageAttributes = ia;
}
protected virtual void SetAppearance(VisualAppearance appearance)
{
switch(appearance)
{
case VisualAppearance.MultiForm:
case VisualAppearance.MultiBox:
_shrinkPagesToFit = true; // shrink tabs to fit width
_positionAtTop = false; // draw tabs at bottom of control
_showClose = false; // do not show the close button
_showArrows = false; // do not show the scroll arrow buttons
_boldSelected = false; // do not show selected pages in bold
_idePixelArea = true; // show a one pixel border at top or bottom
IDEPixelBorder = false; // do not show a one pixel border round control
break;
case VisualAppearance.MultiDocument:
_shrinkPagesToFit = false; // shrink tabs to fit width
_positionAtTop = true; // draw tabs at bottom of control
_showClose = true; // do not show the close button
_showArrows = true; // do not show the scroll arrow buttons
_boldSelected = true; // do not show selected pages in bold
_idePixelArea = true; // show a one pixel border at top or bottom
IDEPixelBorder = false; // do not show a one pixel border round control
break;
}
// These properties are the same whichever style is selected
_hotTrack = false; // do not hot track paes
_dimUnselected = true; // draw dimmed non selected pages
// Define then starting page for drawing
if (_tabPages.Count > 0)
_startPage = 0;
else
_startPage = -1;
_appearance = appearance;
// Define the correct style indexer
SetStyleIndex();
}
protected virtual void SetStyleIndex()
{
switch(_appearance)
{
case VisualAppearance.MultiBox:
// Always pretend we are plain style
_styleIndex = 1;
break;
case VisualAppearance.MultiForm:
case VisualAppearance.MultiDocument:
_styleIndex = (int)_style;
break;
}
}
protected virtual bool HideTabsCalculation()
{
bool hideTabs = false;
switch(_hideTabsMode)
{
case HideTabsModes.ShowAlways:
hideTabs = false;
break;
case HideTabsModes.HideAlways:
hideTabs = true;
break;
case HideTabsModes.HideUsingLogic:
hideTabs = (_tabPages.Count <= 1);
break;
case HideTabsModes.HideWithoutMouse:
hideTabs = !_mouseOver;
break;
}
return hideTabs;
}
protected virtual void Recalculate()
{
// Reset the need for a recalculation
_recalculate = false;
// The height of a tab button is...
int tabButtonHeight = _position[_styleIndex, (int)PositionIndex.ImageGapTop] +
_imageGapTopExtra +
_imageHeight +
_imageGapBottomExtra +
_position[_styleIndex, (int)PositionIndex.ImageGapBottom] +
_position[_styleIndex, (int)PositionIndex.BorderBottom];
// The height of the tabs area is...
int tabsAreaHeight = _position[_styleIndex, (int)PositionIndex.BorderTop] +
tabButtonHeight + _position[_styleIndex, (int)PositionIndex.TabsBottomGap];
bool hideTabsArea = HideTabsCalculation();
// Should the tabs area be hidden?
if (hideTabsArea)
{
// ... then do not show the tabs or button controls
_pageAreaRect = new Rectangle(0, 0, this.Width, this.Height);
_tabsAreaRect = new Rectangle(0, 0, 0, 0);
}
else
{
if (_positionAtTop)
{
// Create rectangle that represents the entire tabs area
_pageAreaRect = new Rectangle(0, tabsAreaHeight, this.Width, this.Height - tabsAreaHeight);
// Create rectangle that represents the entire area for pages
_tabsAreaRect = new Rectangle(0, 0, this.Width, tabsAreaHeight);
}
else
{
// Create rectangle that represents the entire tabs area
_tabsAreaRect = new Rectangle(0, this.Height - tabsAreaHeight, this.Width, tabsAreaHeight);
// Create rectangle that represents the entire area for pages
_pageAreaRect = new Rectangle(0, 0, this.Width, this.Height - tabsAreaHeight);
}
}
int xEndPos = 0;
if (!hideTabsArea && _tabPages.Count > 0)
{
// The minimum size of a button includes its left and right borders for width,
// and then fixed height which is based on the size of the image and font
Rectangle tabPosition;
if (_positionAtTop)
tabPosition = new Rectangle(0,
_tabsAreaRect.Bottom - tabButtonHeight -
_position[_styleIndex, (int)PositionIndex.BorderTop],
_position[_styleIndex, (int)PositionIndex.BorderLeft] +
_position[_styleIndex, (int)PositionIndex.BorderRight],
tabButtonHeight);
else
tabPosition = new Rectangle(0,
_tabsAreaRect.Top +
_position[_styleIndex, (int)PositionIndex.BorderTop],
_position[_styleIndex, (int)PositionIndex.BorderLeft] +
_position[_styleIndex, (int)PositionIndex.BorderRight],
tabButtonHeight);
// Find starting and ending positons for drawing tabs
int xStartPos = _tabsAreaRect.Left + _tabsAreaStartInset;
xEndPos = GetMaximumDrawPos();
// Available width for tabs is size between start and end positions
int xWidth = xEndPos - xStartPos;
if (_multiline)
RecalculateMultilineTabs(xStartPos, xEndPos, tabPosition, tabButtonHeight);
else
RecalculateSinglelineTabs(xWidth, xStartPos, tabPosition);
}
// Position of Controls defaults to the entire page area
_pageRect = _pageAreaRect;
// Adjust child controls positions depending on style
if ((_style == VisualStyle.Plain) && (_appearance != VisualAppearance.MultiBox))
{
_pageRect = _pageAreaRect;
// Shrink by having a border on left,top and right borders
_pageRect.X += _plainBorderDouble;
_pageRect.Width -= (_plainBorderDouble * 2) - 1;
if (!_positionAtTop)
_pageRect.Y += _plainBorderDouble;
_pageRect.Height -= _plainBorderDouble - 1;
// If hiding the tabs then need to adjust the controls positioning
if (hideTabsArea)
{
_pageRect.Height -= _plainBorderDouble;
if (_positionAtTop)
_pageRect.Y += _plainBorderDouble;
}
}
// Calcualte positioning of the child controls/forms
int leftOffset = _ctrlLeftOffset;
int rightOffset = _ctrlRightOffset;
int topOffset = _ctrlTopOffset;
int bottomOffset = _ctrlBottomOffset;
if (_idePixelBorder && (_style == VisualStyle.IDE))
{
leftOffset += 2;
rightOffset += 2;
if (_positionAtTop || hideTabsArea)
bottomOffset += 2;
if (!_positionAtTop || hideTabsArea)
topOffset += 2;
}
Point pageLoc = new Point(_pageRect.Left + leftOffset,
_pageRect.Top + topOffset);
Size pageSize = new Size(_pageRect.Width - leftOffset - rightOffset,
_pageRect.Height - topOffset - bottomOffset);
// If in Plain style and requested to only show top or bottom border
if ((_style == VisualStyle.Plain) && _insetBorderPagesOnly)
{
// Then need to increase width to occupy where borders would have been
pageLoc.X -= _plainBorderDouble;
pageSize.Width += _plainBorderDouble * 2;
if (hideTabsArea || _positionAtTop)
{
// Draw into the bottom border area
pageSize.Height += _plainBorderDouble;
}
if (hideTabsArea || !_positionAtTop)
{
// Draw into the top border area
pageLoc.Y -= _plainBorderDouble;
pageSize.Height += _plainBorderDouble;
}
}
// Position the host panel appropriately
_hostPanel.Size = pageSize;
_hostPanel.Location = pageLoc;
// If we have any tabs at all
if (_tabPages.Count > 0)
{
Rectangle rect = (Rectangle)_tabRects[_tabPages.Count - 1];
// Determine is the right scrolling button should be enabled
_rightScroll = (rect.Right > xEndPos);
}
else
{
// No pages means there can be no right scrolling
_rightScroll = false;
}
// Determine if left scrolling is possible
_leftScroll = (_startPage > 0);
// Handle then display and positioning of buttons
RecalculateButtons();
}
protected virtual void RecalculateMultilineTabs(int xStartPos, int xEndPos,
Rectangle tabPosition, int tabButtonHeight)
{
using (Graphics g = this.CreateGraphics())
{
// MultiBox style needs a pixel extra drawing room on right
if (_appearance == VisualAppearance.MultiBox)
xEndPos-=2;
// How many tabs on this line
int lineCount = 0;
// Remember which line is?? 快捷鍵說明
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