void LLScrollbar::updateThumbRect()
{
// llassert( 0 <= mDocSize );
// llassert( 0 <= mDocPos && mDocPos <= getDocPosMax() );
const S32 THUMB_MIN_LENGTH = 16;
S32 window_length = (mOrientation == LLScrollbar::HORIZONTAL) ? getRect().getWidth() : getRect().getHeight();
S32 thumb_bg_length = llmax(0, window_length - 2 * SCROLLBAR_SIZE);
S32 visible_lines = llmin( mDocSize, mPageSize );
S32 thumb_length = mDocSize ? llmin(llmax( visible_lines * thumb_bg_length / mDocSize, THUMB_MIN_LENGTH), thumb_bg_length) : thumb_bg_length;
S32 variable_lines = mDocSize - visible_lines;
if( mOrientation == LLScrollbar::VERTICAL )
{
S32 thumb_start_max = thumb_bg_length + SCROLLBAR_SIZE;
S32 thumb_start_min = SCROLLBAR_SIZE + THUMB_MIN_LENGTH;
S32 thumb_start = variable_lines ? llmin( llmax(thumb_start_max - (mDocPos * (thumb_bg_length - thumb_length)) / variable_lines, thumb_start_min), thumb_start_max ) : thumb_start_max;
mThumbRect.mLeft = 0;
mThumbRect.mTop = thumb_start;
mThumbRect.mRight = SCROLLBAR_SIZE;
mThumbRect.mBottom = thumb_start - thumb_length;
}
else
{
// Horizontal
S32 thumb_start_max = thumb_bg_length + SCROLLBAR_SIZE - thumb_length;
S32 thumb_start_min = SCROLLBAR_SIZE;
S32 thumb_start = variable_lines ? llmin(llmax( thumb_start_min + (mDocPos * (thumb_bg_length - thumb_length)) / variable_lines, thumb_start_min), thumb_start_max ) : thumb_start_min;
mThumbRect.mLeft = thumb_start;
mThumbRect.mTop = SCROLLBAR_SIZE;
mThumbRect.mRight = thumb_start + thumb_length;
mThumbRect.mBottom = 0;
}
if (mOnScrollEndCallback && mOnScrollEndData && (mDocPos == getDocPosMax()))
{
mOnScrollEndCallback(mOnScrollEndData);
}
}
void LLScrollbar::setDocPos(S32 pos, BOOL update_thumb)
{
pos = llclamp(pos, 0, getDocPosMax());
if (pos != mDocPos)
{
mDocPos = pos;
mDocChanged = TRUE;
if( mChangeCallback )
{
mChangeCallback( mDocPos, this, mCallbackUserData );
}
if( update_thumb )
{
updateThumbRect();
}
}
}
// returns true if document position really changed
bool LLScrollbar::setDocPos(S32 pos, BOOL update_thumb)
{
pos = llclamp(pos, 0, getDocPosMax());
if (pos != mDocPos)
{
mDocPos = pos;
mDocChanged = TRUE;
if( mChangeCallback )
{
mChangeCallback( mDocPos, this );
}
if( update_thumb )
{
updateThumbRect();
}
return true;
}
return false;
}
BOOL LLScrollbar::handleKeyHere(KEY key, MASK mask)
{
BOOL handled = FALSE;
switch( key )
{
case KEY_HOME:
setDocPos( 0 );
handled = TRUE;
break;
case KEY_END:
setDocPos( getDocPosMax() );
handled = TRUE;
break;
case KEY_DOWN:
setDocPos( getDocPos() + mStepSize );
handled = TRUE;
break;
case KEY_UP:
setDocPos( getDocPos() - mStepSize );
handled = TRUE;
break;
case KEY_PAGE_DOWN:
pageDown(1);
break;
case KEY_PAGE_UP:
pageUp(1);
break;
}
return handled;
}
void LLScrollbar::draw()
{
if (!getRect().isValid()) return;
S32 local_mouse_x;
S32 local_mouse_y;
LLUI::getCursorPositionLocal(this, &local_mouse_x, &local_mouse_y);
BOOL other_captor = gFocusMgr.getMouseCapture() && gFocusMgr.getMouseCapture() != this;
BOOL hovered = getEnabled() && !other_captor && (hasMouseCapture() || mThumbRect.pointInRect(local_mouse_x, local_mouse_y));
if (hovered)
{
mCurGlowStrength = lerp(mCurGlowStrength, mHoverGlowStrength, LLCriticalDamp::getInterpolant(0.05f));
}
else
{
mCurGlowStrength = lerp(mCurGlowStrength, 0.f, LLCriticalDamp::getInterpolant(0.05f));
}
// Draw background and thumb.
LLUIImage* rounded_rect_imagep = LLUI::sImageProvider->getUIImage("rounded_square.tga");
if (!rounded_rect_imagep)
{
gl_rect_2d(mOrientation == HORIZONTAL ? SCROLLBAR_SIZE : 0,
mOrientation == VERTICAL ? getRect().getHeight() - 2 * SCROLLBAR_SIZE : getRect().getHeight(),
mOrientation == HORIZONTAL ? getRect().getWidth() - 2 * SCROLLBAR_SIZE : getRect().getWidth(),
mOrientation == VERTICAL ? SCROLLBAR_SIZE : 0, mTrackColor, TRUE);
gl_rect_2d(mThumbRect, mThumbColor, TRUE);
}
else
{
// Background
rounded_rect_imagep->drawSolid(mOrientation == HORIZONTAL ? SCROLLBAR_SIZE : 0,
mOrientation == VERTICAL ? SCROLLBAR_SIZE : 0,
mOrientation == HORIZONTAL ? getRect().getWidth() - 2 * SCROLLBAR_SIZE : getRect().getWidth(),
mOrientation == VERTICAL ? getRect().getHeight() - 2 * SCROLLBAR_SIZE : getRect().getHeight(),
mTrackColor);
// Thumb
LLRect outline_rect = mThumbRect;
outline_rect.stretch(2);
if (gFocusMgr.getKeyboardFocus() == this)
{
rounded_rect_imagep->draw(outline_rect, gFocusMgr.getFocusColor());
}
rounded_rect_imagep->draw(mThumbRect, mThumbColor);
if (mCurGlowStrength > 0.01f)
{
gGL.setSceneBlendType(LLRender::BT_ADD_WITH_ALPHA);
rounded_rect_imagep->drawSolid(mThumbRect, LLColor4(1.f, 1.f, 1.f, mCurGlowStrength));
gGL.setSceneBlendType(LLRender::BT_ALPHA);
}
}
BOOL was_scrolled_to_bottom = (getDocPos() == getDocPosMax());
if (mOnScrollEndCallback && was_scrolled_to_bottom)
{
mOnScrollEndCallback(mOnScrollEndData);
}
// Draw children
LLView::draw();
} // end draw
BOOL LLScrollbar::handleHover(S32 x, S32 y, MASK mask)
{
// Note: we don't bother sending the event to the children (the arrow buttons)
// because they'll capture the mouse whenever they need hover events.
BOOL handled = FALSE;
if( hasMouseCapture() )
{
S32 height = getRect().getHeight();
S32 width = getRect().getWidth();
if( VERTICAL == mOrientation )
{
// S32 old_pos = mThumbRect.mTop;
S32 delta_pixels = y - mDragStartY;
if( mOrigRect.mBottom + delta_pixels < SCROLLBAR_SIZE )
{
delta_pixels = SCROLLBAR_SIZE - mOrigRect.mBottom - 1;
}
else if( mOrigRect.mTop + delta_pixels > height - SCROLLBAR_SIZE )
{
delta_pixels = height - SCROLLBAR_SIZE - mOrigRect.mTop + 1;
}
mThumbRect.mTop = mOrigRect.mTop + delta_pixels;
mThumbRect.mBottom = mOrigRect.mBottom + delta_pixels;
S32 thumb_length = mThumbRect.getHeight();
S32 thumb_track_length = height - 2 * SCROLLBAR_SIZE;
if( delta_pixels != mLastDelta || mDocChanged)
{
// Note: delta_pixels increases as you go up. mDocPos increases down (line 0 is at the top of the page).
S32 usable_track_length = thumb_track_length - thumb_length;
if( 0 < usable_track_length )
{
S32 variable_lines = getDocPosMax();
S32 pos = mThumbRect.mTop;
F32 ratio = F32(pos - SCROLLBAR_SIZE - thumb_length) / usable_track_length;
S32 new_pos = llclamp( S32(variable_lines - ratio * variable_lines + 0.5f), 0, variable_lines );
// Note: we do not call updateThumbRect() here. Instead we let the thumb and the document go slightly
// out of sync (less than a line's worth) to make the thumb feel responsive.
changeLine( new_pos - mDocPos, FALSE );
}
}
mLastDelta = delta_pixels;
}
else
{
// Horizontal
// S32 old_pos = mThumbRect.mLeft;
S32 delta_pixels = x - mDragStartX;
if( mOrigRect.mLeft + delta_pixels < SCROLLBAR_SIZE )
{
delta_pixels = SCROLLBAR_SIZE - mOrigRect.mLeft - 1;
}
else if( mOrigRect.mRight + delta_pixels > width - SCROLLBAR_SIZE )
{
delta_pixels = width - SCROLLBAR_SIZE - mOrigRect.mRight + 1;
}
mThumbRect.mLeft = mOrigRect.mLeft + delta_pixels;
mThumbRect.mRight = mOrigRect.mRight + delta_pixels;
S32 thumb_length = mThumbRect.getWidth();
S32 thumb_track_length = width - 2 * SCROLLBAR_SIZE;
if( delta_pixels != mLastDelta || mDocChanged)
{
// Note: delta_pixels increases as you go up. mDocPos increases down (line 0 is at the top of the page).
S32 usable_track_length = thumb_track_length - thumb_length;
if( 0 < usable_track_length )
{
S32 variable_lines = getDocPosMax();
S32 pos = mThumbRect.mLeft;
F32 ratio = F32(pos - SCROLLBAR_SIZE) / usable_track_length;
S32 new_pos = llclamp( S32(ratio * variable_lines + 0.5f), 0, variable_lines);
// Note: we do not call updateThumbRect() here. Instead we let the thumb and the document go slightly
// out of sync (less than a line's worth) to make the thumb feel responsive.
changeLine( new_pos - mDocPos, FALSE );
}
}
mLastDelta = delta_pixels;
}
getWindow()->setCursor(UI_CURSOR_ARROW);
lldebugst(LLERR_USER_INPUT) << "hover handled by " << getName() << " (active)" << llendl;
handled = TRUE;
}
else
{
handled = childrenHandleMouseUp( x, y, mask ) != NULL;
}
// Opaque
if( !handled )
{
getWindow()->setCursor(UI_CURSOR_ARROW);
lldebugst(LLERR_USER_INPUT) << "hover handled by " << getName() << " (inactive)" << llendl;
handled = TRUE;
}
mDocChanged = FALSE;
return handled;
} // end handleHover
BOOL LLScrollbar::isAtEnd()
{
return mDocPos == getDocPosMax();
}