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tweak pixfader:

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* update reserve so that round corners don't overlap
* draw complete 1px outline
* add API to hide/show the unity line
* don't show unity line at either end
* allow to shrink when the font-scaling changes
This commit is contained in:
Robin Gareus 2014-09-02 16:00:24 +02:00
parent 88df9c28a6
commit ecf5d5f137
2 changed files with 41 additions and 26 deletions
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8
libs/gtkmm2ext/gtkmm2ext/pixfader.h
View File

@ -42,7 +42,8 @@ class LIBGTKMM2EXT_API PixFader : public Gtk::DrawingArea
sigc::signal<void> OnExpose;
void set_default_value (float);
void set_text (const std::string&, bool centered = true);
void set_text (const std::string&, bool centered = true, bool expose = true);
void show_unity_line (bool yn);
protected:
Glib::RefPtr<Pango::Layout> _layout;
@ -72,8 +73,8 @@ class LIBGTKMM2EXT_API PixFader : public Gtk::DrawingArea
};
private:
int _span;
int _girth;
int _span, _girth;
int _min_span, _min_girth;
int _orien;
cairo_pattern_t* _pattern;
bool _hovering;
@ -85,6 +86,7 @@ class LIBGTKMM2EXT_API PixFader : public Gtk::DrawingArea
float _default_value;
int _unity_loc;
bool _centered_text;
bool _display_unity_line;
sigc::connection _parent_style_change;
Widget * _current_parent;

59
libs/gtkmm2ext/pixfader.cc
View File

@ -36,7 +36,7 @@ using namespace std;
#define CORNER_RADIUS 4
#define CORNER_SIZE 2
#define CORNER_OFFSET 1
#define FADER_RESERVE 5
#define FADER_RESERVE 6 // >= 1.5 * CORNER_RADIUS
std::list<PixFader::FaderImage*> PixFader::_patterns;
@ -44,12 +44,15 @@ PixFader::PixFader (Gtk::Adjustment& adj, int orientation, int fader_length, int
: adjustment (adj)
, _span (fader_length)
, _girth (fader_girth)
, _min_span (fader_length)
, _min_girth (fader_girth)
, _orien (orientation)
, _pattern (0)
, _hovering (false)
, _last_drawn (-1)
, _dragging (false)
, _centered_text (true)
, _display_unity_line (true)
, _current_parent (0)
{
_default_value = adjustment.get_value();
@ -225,13 +228,13 @@ PixFader::on_expose_event (GdkEventExpose* ev)
cairo_rectangle (cr, 0, 0, w, h);
cairo_fill(cr);
cairo_set_line_width (cr, 1);
cairo_set_line_width (cr, 2);
cairo_set_source_rgba (cr, 0, 0, 0, 1.0);
cairo_matrix_t matrix;
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET, w-CORNER_SIZE, h-CORNER_SIZE, CORNER_RADIUS);
// we use a 'trick' here: The stoke is off by .5px but filling the interiour area
// results in an outline of 0.5 px the actual outline is exatly 1px at 50% alpha.
// we use a 'trick' here: The stoke is off by .5px but filling the interior area
// after a stroke of 2px width results in an outline of 1px
cairo_stroke_preserve(cr);
if (_orien == VERT) {
@ -279,25 +282,25 @@ PixFader::on_expose_event (GdkEventExpose* ev)
cairo_fill (cr);
CairoWidget::set_source_rgb_a (cr, get_style()->get_fg (get_state()), 1);
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET,
ds - CORNER_OFFSET, h - CORNER_SIZE, CORNER_RADIUS);
ds - CORNER_SIZE, h - CORNER_SIZE, CORNER_RADIUS);
}
cairo_fill (cr);
}
/* draw the unity-position line if it's not at either end*/
if (_unity_loc > 0) {
if (_display_unity_line && _unity_loc > CORNER_RADIUS) {
context->set_line_width (1);
context->set_line_cap (Cairo::LINE_CAP_ROUND);
Gdk::Color c = get_style()->get_fg (Gtk::STATE_ACTIVE);
context->set_source_rgba (c.get_red_p()*1.5, c.get_green_p()*1.5, c.get_blue_p()*1.5, 0.85);
if ( _orien == VERT) {
if (_unity_loc < h ) {
context->set_source_rgba (c.get_red_p() * 1.5, c.get_green_p() * 1.5, c.get_blue_p() * 1.5, 0.85);
if (_orien == VERT) {
if (_unity_loc < h - CORNER_RADIUS) {
context->move_to (1.5, _unity_loc + CORNER_OFFSET + .5);
context->line_to (_girth - 1.5, _unity_loc + CORNER_OFFSET + .5);
context->stroke ();
}
} else {
if ( _unity_loc < w ){
if (_unity_loc < w - CORNER_RADIUS) {
context->move_to (_unity_loc - CORNER_OFFSET + .5, 1.5);
context->line_to (_unity_loc - CORNER_OFFSET + .5, _girth - 1.5);
context->stroke ();
@ -340,11 +343,11 @@ void
PixFader::on_size_request (GtkRequisition* req)
{
if (_orien == VERT) {
req->width = (_girth ? _girth : -1);
req->height = (_span ? _span : -1);
req->width = (_min_girth ? _min_girth : -1);
req->height = (_min_span ? _min_span : -1);
} else {
req->height = (_girth ? _girth : -1);
req->width = (_span ? _span : -1);
req->height = (_min_girth ? _min_girth : -1);
req->width = (_min_span ? _min_span : -1);
}
}
@ -406,7 +409,7 @@ PixFader::on_button_press_event (GdkEventButton* ev)
bool
PixFader::on_button_release_event (GdkEventButton* ev)
{
double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
double ev_pos = (_orien == VERT) ? ev->y : ev->x;
switch (ev->button) {
case 1:
@ -422,16 +425,17 @@ PixFader::on_button_release_event (GdkEventButton* ev)
}
if (ev_pos == _grab_start) {
/* no motion - just a click */
const double slider_pos = display_span();
ev_pos = rint(ev_pos);
if (ev->state & Keyboard::TertiaryModifier) {
adjustment.set_value (_default_value);
} else if (ev->state & Keyboard::GainFineScaleModifier) {
adjustment.set_value (adjustment.get_lower());
} else if (ev_pos == display_span()) {
} else if (ev_pos == slider_pos) {
; // click on current position, no move.
} else if ((_orien == VERT && ev_pos < display_span()) || (_orien == HORIZ && ev_pos > display_span())) {
} else if ((_orien == VERT && ev_pos < slider_pos) || (_orien == HORIZ && ev_pos > slider_pos)) {
/* above the current display height, remember X Window coords */
adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
} else {
@ -573,9 +577,9 @@ PixFader::display_span ()
float fract = (adjustment.get_value () - adjustment.get_lower()) / ((adjustment.get_upper() - adjustment.get_lower()));
int ds;
if (_orien == VERT) {
ds = (int)floor (_span * (1.0 - fract));
ds = (int)rint (_span * (1.0 - fract));
} else {
ds = (int)floor (_span * fract);
ds = (int)rint (_span * fract);
}
return ds;
@ -632,7 +636,15 @@ PixFader::set_default_value (float d)
}
void
PixFader::set_text (const std::string& str, bool centered)
PixFader::show_unity_line (bool yn )
{
if (yn == _display_unity_line) return;
_display_unity_line = yn;
queue_draw();
}
void
PixFader::set_text (const std::string& str, bool centered, bool expose)
{
if (_layout && _text == str) {
return;
@ -646,7 +658,8 @@ PixFader::set_text (const std::string& str, bool centered)
if (_layout) {
_layout->set_text (str);
_layout->get_pixel_size (_text_width, _text_height);
queue_resize ();
// queue_resize ();
if (expose) queue_draw ();
}
}
@ -665,7 +678,7 @@ PixFader::on_style_changed (const Glib::RefPtr<Gtk::Style>&)
std::string txt = _layout->get_text();
_layout.clear (); // drop reference to existing layout
_text = "";
set_text (txt, _centered_text);
set_text (txt, _centered_text, false);
}
/* patterns are cached and re-created as needed
* during 'expose' in the GUI thread */