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Added more control over how the scrollable_region scrolls its region.

Browse Source 
You can now adjust how much it scrolls when the mouse wheel is scrolled
as well as enabling scrolling via a mouse drag.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402535
This commit is contained in:
Davis King 2008-10-02 00:39:18 +00:00
parent 88d4e166a4
commit ebf49a9c9b
3 changed files with 200 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

143
dlib/gui_widgets/base_widgets.h
View File

@ -2667,15 +2667,29 @@ namespace dlib
- border_size == 2
- hscroll_bar_inc == 1
- vscroll_bar_inc == 1
- h_wheel_scroll_bar_inc == 1
- v_wheel_scroll_bar_inc == 1
- mouse_drag_enabled_ == false
- user_is_dragging_mouse == false
CONVENTION
- mouse_drag_enabled() == mouse_drag_enabled_
- border_size == 2
- horizontal_scroll_increment() == hscroll_bar_inc
- vertical_scroll_increment() == vscroll_bar_inc
- horizontal_mouse_wheel_scroll_increment() == h_wheel_scroll_bar_inc
- vertical_mouse_wheel_scroll_increment() == v_wheel_scroll_bar_inc
- vertical_scroll_pos() == vsb.slider_pos()
- horizontal_scroll_pos() == hsb.slider_pos()
- total_rect() == total_rect_
- display_rect() == display_rect_
- if (the user is currently dragging the total_rect around with a mouse drag) then
- user_is_dragging_mouse == true
- drag_origin == the point the mouse was at, with respect to total_rect,
when the dragging started
- else
- user_is_dragging_mouse == false
!*/
public:
@ -2684,12 +2698,16 @@ namespace dlib
drawable_window& w,
unsigned long events = 0
) :
drawable(w, MOUSE_WHEEL|events),
drawable(w, MOUSE_WHEEL|events|MOUSE_CLICK|MOUSE_MOVE),
hsb(w,scroll_bar::HORIZONTAL),
vsb(w,scroll_bar::VERTICAL),
border_size(2),
hscroll_bar_inc(1),
vscroll_bar_inc(1)
vscroll_bar_inc(1),
h_wheel_scroll_bar_inc(1),
v_wheel_scroll_bar_inc(1),
mouse_drag_enabled_(false),
user_is_dragging_mouse(false)
{
hsb.set_scroll_handler(*this,&scrollable_region::on_h_scroll);
vsb.set_scroll_handler(*this,&scrollable_region::on_v_scroll);
@ -2853,6 +2871,37 @@ namespace dlib
parent.invalidate_rectangle(rect+old);
}
unsigned long horizontal_mouse_wheel_scroll_increment (
) const
{
auto_mutex M(m);
return h_wheel_scroll_bar_inc;
}
unsigned long vertical_mouse_wheel_scroll_increment (
) const
{
auto_mutex M(m);
return v_wheel_scroll_bar_inc;
}
void set_horizontal_mouse_wheel_scroll_increment (
unsigned long inc
)
{
auto_mutex M(m);
h_wheel_scroll_bar_inc = inc;
}
void set_vertical_mouse_wheel_scroll_increment (
unsigned long inc
)
{
auto_mutex M(m);
v_wheel_scroll_bar_inc = inc;
}
unsigned long horizontal_scroll_increment (
) const
{
@ -2939,6 +2988,27 @@ namespace dlib
total_rect_ = move_rect(total_rect_, display_rect_.left()+delta_x, display_rect_.top()+delta_y);
}
bool mouse_drag_enabled (
) const
{
auto_mutex M(m);
return mouse_drag_enabled_;
}
void enable_mouse_drag (
)
{
auto_mutex M(m);
mouse_drag_enabled_ = true;
}
void disable_mouse_drag (
)
{
auto_mutex M(m);
mouse_drag_enabled_ = false;
}
protected:
const rectangle& display_rect (
@ -3025,19 +3095,67 @@ namespace dlib
{
if (need_v_scroll())
{
unsigned long pos = vsb.slider_pos();
vsb.set_slider_pos(pos+1);
long pos = vsb.slider_pos();
vsb.set_slider_pos(pos+(long)v_wheel_scroll_bar_inc);
on_v_scroll();
}
else if (need_h_scroll())
{
unsigned long pos = hsb.slider_pos();
hsb.set_slider_pos(pos+1);
long pos = hsb.slider_pos();
hsb.set_slider_pos(pos+(long)h_wheel_scroll_bar_inc);
on_h_scroll();
}
}
}
void on_mouse_move (
unsigned long state,
long x,
long y
)
{
if (enabled && !hidden && user_is_dragging_mouse && state==base_window::LEFT)
{
point current_delta = point(x,y) - point(total_rect().left(), total_rect().top());
rectangle new_rect(translate_rect(display_rect(), drag_origin - current_delta));
new_rect = centered_rect(new_rect, new_rect.width()-hscroll_bar_inc, new_rect.height()-vscroll_bar_inc);
scroll_to_rect(new_rect);
}
else
{
user_is_dragging_mouse = false;
}
}
void on_mouse_down (
unsigned long btn,
unsigned long state,
long x,
long y,
bool is_double_click
)
{
if (mouse_drag_enabled_ && enabled && !hidden && display_rect().contains(x,y) && (btn==base_window::LEFT))
{
drag_origin = point(x,y) - point(total_rect().left(), total_rect().top());
user_is_dragging_mouse = true;
}
else
{
user_is_dragging_mouse = false;
}
}
void on_mouse_up (
unsigned long btn,
unsigned long state,
long x,
long y
)
{
user_is_dragging_mouse = false;
}
void on_wheel_up (
unsigned long state
)
@ -3046,14 +3164,14 @@ namespace dlib
{
if (need_v_scroll())
{
unsigned long pos = vsb.slider_pos();
vsb.set_slider_pos(pos-1);
long pos = vsb.slider_pos();
vsb.set_slider_pos(pos-(long)v_wheel_scroll_bar_inc);
on_v_scroll();
}
else if (need_h_scroll())
{
unsigned long pos = hsb.slider_pos();
hsb.set_slider_pos(pos-1);
long pos = hsb.slider_pos();
hsb.set_slider_pos(pos-(long)h_wheel_scroll_bar_inc);
on_h_scroll();
}
}
@ -3131,6 +3249,11 @@ namespace dlib
const unsigned long border_size;
unsigned long hscroll_bar_inc;
unsigned long vscroll_bar_inc;
unsigned long h_wheel_scroll_bar_inc;
unsigned long v_wheel_scroll_bar_inc;
bool mouse_drag_enabled_;
bool user_is_dragging_mouse;
point drag_origin;
};
scrollable_region::~scrollable_region(){}

66
dlib/gui_widgets/base_widgets_abstract.h
View File

@ -1565,9 +1565,12 @@ namespace dlib
INITIAL VALUE
- horizontal_scroll_pos() == 0
- horizontal_scroll_increment() == 1
- horizontal_mouse_wheel_scroll_increment() == 1
- vertical_scroll_pos() == 0
- vertical_scroll_increment() == 1
- vertical_mouse_wheel_scroll_increment() == 1
- total_rect().empty() == true
- mouse_drag_enabled() == false
WHAT THIS OBJECT REPRESENTS
This object represents a 2D region of arbitrary size that is displayed
@ -1665,6 +1668,39 @@ namespace dlib
- #vertical_scroll_pos() == the valid scroll position closest to pos
!*/
unsigned long horizontal_mouse_wheel_scroll_increment (
) const;
/*!
ensures
- returns the number of positions the horizontal scroll bar
moves when the user scrolls the mouse wheel.
!*/
unsigned long vertical_mouse_wheel_scroll_increment (
) const;
/*!
ensures
- returns the number of positions the vertical scroll bar
moves when the user scrolls the mouse wheel.
!*/
void set_horizontal_mouse_wheel_scroll_increment (
unsigned long inc
);
/*!
ensures
- #horizontal_mouse_wheel_scroll_increment() == inc
!*/
void set_vertical_mouse_wheel_scroll_increment (
unsigned long inc
);
/*!
ensures
- #vertical_mouse_wheel_scroll_increment() == inc
!*/
unsigned long horizontal_scroll_increment (
) const;
/*!
@ -1697,6 +1733,31 @@ namespace dlib
- #vertical_scroll_increment() == inc
!*/
bool mouse_drag_enabled (
) const;
/*!
ensures
- if (the user can drag this contents of this widget around by
holding down the left mouse button and dragging) then
- returns true
- else
- returns false
!*/
void enable_mouse_drag (
);
/*!
ensures
- #mouse_drag_enabled() == true
!*/
void disable_mouse_drag (
);
/*!
ensures
- #mouse_drag_enabled() == false
!*/
protected:
rectangle display_rect (
@ -1757,7 +1818,10 @@ namespace dlib
// this object performs)
void on_wheel_down (unsigned long state);
void on_wheel_up (unsigned long state);
void on_wheel_up (unsigned long state);
void on_mouse_move (unsigned long state, long x, long y);
void on_mouse_down (unsigned long btn, unsigned long state, long x, long y, bool is_double_click);
void on_mouse_up (unsigned long btn, unsigned long state, long x, long y);
void draw (const canvas& c) const;
private:

2
dlib/gui_widgets/widgets.h
View File

@ -3864,6 +3864,7 @@ namespace dlib
bool is_double_click
)
{
scrollable_region::on_mouse_down(btn, state, x, y, is_double_click);
if (display_rect().contains(x,y) && enabled && !hidden)
{
// figure out which box this click landed in
@ -3931,6 +3932,7 @@ namespace dlib
long y
)
{
scrollable_region::on_mouse_up(btn, state, x, y);
}
void on_focus_lost (