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Avoid scroll bar overshooting

This commit is contained in:
Markus Gans 2018-02-18 21:50:24 +01:00
parent 0f16b51e04
commit 69956ce76f
3 changed files with 112 additions and 59 deletions
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4
ChangeLog
View File

@ -1,3 +1,7 @@
2017-02-18 Markus Gans <guru.mail@muenster.de>
* Avoid scroll bar overshooting
* Refactoring FListView::onMouseMove
2017-02-17 Markus Gans <guru.mail@muenster.de>
* Generalize scroll functions in FTextView
* Refactoring FButtonGroup::drawLabel

5
include/final/fscrollbar.h
View File

@ -132,7 +132,10 @@ class FScrollbar : public FWidget
sType getClickedScrollType (int, int);
sType getVerticalClickedScrollType (int);
sType getHorizontalClickedScrollType (int);
void processMiddleButton (int, int);
int getSliderClickPos (int, int);
void jumpToClickPos (int, int);
void jumpToClickPos (int);
void avoidScrollOvershoot();
void processScroll();
// Data Members

106
src/fscrollbar.cpp
View File

@ -385,7 +385,7 @@ void FScrollbar::onMouseDown (FMouseEvent* ev)
if ( ev->getButton() == fc::MiddleButton )
{
processMiddleButton (mouse_x, mouse_y);
jumpToClickPos (mouse_x, mouse_y);
return;
}
@ -394,27 +394,7 @@ void FScrollbar::onMouseDown (FMouseEvent* ev)
if ( scroll_type == FScrollbar::noScroll )
{
if ( bar_orientation == fc::vertical )
{
if ( mouse_y > slider_pos + 1
&& mouse_y <= slider_pos + slider_length + 1 )
slider_click_pos = mouse_y; // on slider
}
else // horizontal
{
if ( isNewFont() )
{
if ( mouse_x > slider_pos + 2
&& mouse_x <= slider_pos + slider_length + 2 )
slider_click_pos = mouse_x; // on slider
}
else
{
if ( mouse_x > slider_pos + 1
&& mouse_x <= slider_pos + slider_length + 1 )
slider_click_pos = mouse_x; // on slider
}
}
slider_click_pos = getSliderClickPos (mouse_x, mouse_y);
if ( slider_click_pos > 0 )
scroll_type = FScrollbar::scrollJump;
@ -473,7 +453,7 @@ void FScrollbar::onMouseMove (FMouseEvent* ev)
if ( ev->getButton() == fc::MiddleButton )
{
processMiddleButton (mouse_x, mouse_y);
jumpToClickPos (mouse_x, mouse_y);
return;
}
@ -556,16 +536,24 @@ void FScrollbar::onTimer (FTimerEvent*)
addTimer(repeat_time);
}
// Timer stop condition
if ( ( scroll_type == FScrollbar::scrollPageBackward
&& slider_pos < slider_click_stop_pos )
&& slider_pos == slider_click_stop_pos )
|| ( scroll_type == FScrollbar::scrollPageForward
&& slider_pos + slider_length > slider_click_stop_pos ) )
&& slider_pos == slider_click_stop_pos ) )
{
// Scroll to the end
if ( scroll_type == FScrollbar::scrollPageForward
&& slider_pos + slider_length > slider_click_stop_pos )
int max_slider_pos = bar_length - slider_length;
if ( scroll_type == FScrollbar::scrollPageBackward
&& slider_pos == 0 )
{
setValue(max);
jumpToClickPos(0); // Scroll to the start
processScroll();
}
else if ( scroll_type == FScrollbar::scrollPageForward
&& slider_pos == max_slider_pos )
{
jumpToClickPos (max_slider_pos); // Scroll to the end
processScroll();
}
@ -732,7 +720,37 @@ FScrollbar::sType FScrollbar::getHorizontalClickedScrollType (int x)
}
//----------------------------------------------------------------------
void FScrollbar::processMiddleButton (int x, int y)
int FScrollbar::getSliderClickPos (int mouse_x, int mouse_y)
{
// Get the clicked position on the slider
if ( bar_orientation == fc::vertical )
{
if ( mouse_y > slider_pos + 1
&& mouse_y <= slider_pos + slider_length + 1 )
return mouse_y; // on slider
}
else // horizontal bar orientation
{
if ( isNewFont() )
{
if ( mouse_x > slider_pos + 2
&& mouse_x <= slider_pos + slider_length + 2 )
return mouse_x; // on slider
}
else
{
if ( mouse_x > slider_pos + 1
&& mouse_x <= slider_pos + slider_length + 1 )
return mouse_x; // on slider
}
}
return -1;
}
//----------------------------------------------------------------------
void FScrollbar::jumpToClickPos (int x, int y)
{
int new_val;
@ -769,9 +787,37 @@ void FScrollbar::processMiddleButton (int x, int y)
}
}
//----------------------------------------------------------------------
void FScrollbar::jumpToClickPos (int pos)
{
if ( bar_orientation == fc::vertical )
jumpToClickPos (0, pos + 2);
else
{
if ( isNewFont() )
jumpToClickPos (pos + 3, 0);
else
jumpToClickPos (pos + 2, 0);
}
}
//----------------------------------------------------------------------
void FScrollbar::avoidScrollOvershoot()
{
// Avoid overshoot
if ( ( scroll_type == FScrollbar::scrollPageBackward
&& slider_pos < slider_click_stop_pos )
|| ( scroll_type == FScrollbar::scrollPageForward
&& slider_pos > slider_click_stop_pos ) )
{
jumpToClickPos (slider_click_stop_pos);
delOwnTimer();
}
}
//----------------------------------------------------------------------
void FScrollbar::processScroll()
{
emitCallback("change-value");
avoidScrollOvershoot();
}