[gtksourceview/wip/chergert/gsv-gtk4: 88/131] map: port to GTK 4 measurements and CSS



commit a4d7590c4c05164d82c6df2eab81b8fc4edf1565
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jan 15 13:52:07 2020 -0800

    map: port to GTK 4 measurements and CSS
    
    This updates the GtkSourceMap widget to use (*measure) as well as removal
    of deprecated CSS API. Additionally, we use event controllers for input
    instead of direct event access.

 gtksourceview/gtksourcemap.c | 384 ++++++++++++++++++-------------------------
 1 file changed, 164 insertions(+), 220 deletions(-)
---
diff --git a/gtksourceview/gtksourcemap.c b/gtksourceview/gtksourcemap.c
index 792776e0..410559b7 100644
--- a/gtksourceview/gtksourcemap.c
+++ b/gtksourceview/gtksourcemap.c
@@ -19,14 +19,17 @@
 
 #include "config.h"
 
-#include "gtksourcemap.h"
 #include <string.h>
+
+#include "gtksourcemap.h"
 #include "gtksourcebuffer.h"
 #include "gtksourcecompletion.h"
 #include "gtksourcestyle-private.h"
 #include "gtksourcestylescheme.h"
 #include "gtksourceutils-private.h"
 
+#define SCRUBBER_MIN_HEIGHT 10
+
 /**
  * SECTION:map
  * @Short_description: Widget that displays a map for a specific #GtkSourceView
@@ -189,6 +192,7 @@ update_scrubber_position (GtkSourceMap *map)
        GdkRectangle scrubber_area;
        GtkAllocation alloc;
        GtkAllocation view_alloc;
+       gint ignored;
        gint child_height;
        gint view_height;
        gint y;
@@ -203,8 +207,16 @@ update_scrubber_position (GtkSourceMap *map)
        gtk_widget_get_allocation (GTK_WIDGET (priv->view), &view_alloc);
        gtk_widget_get_allocation (GTK_WIDGET (map), &alloc);
 
-       gtk_widget_get_preferred_height (GTK_WIDGET (priv->view), NULL, &view_height);
-       gtk_widget_get_preferred_height (GTK_WIDGET (map), NULL, &child_height);
+       gtk_widget_measure (GTK_WIDGET (priv->view),
+                           GTK_ORIENTATION_VERTICAL,
+                           gtk_widget_get_width (GTK_WIDGET (priv->view)),
+                           NULL,
+                           &view_height,
+                           NULL, NULL);
+       GTK_WIDGET_CLASS (gtk_source_map_parent_class)->measure (GTK_WIDGET (map),
+                                                                GTK_ORIENTATION_VERTICAL,
+                                                                gtk_widget_get_width (GTK_WIDGET (map)),
+                                                                &ignored, &child_height, &ignored, &ignored);
 
        gtk_text_view_get_visible_rect (GTK_TEXT_VIEW (priv->view), &visible_area);
        gtk_text_view_get_iter_at_location (GTK_TEXT_VIEW (priv->view), &iter,
@@ -225,28 +237,8 @@ update_scrubber_position (GtkSourceMap *map)
 
        if (memcmp (&scrubber_area, &priv->scrubber_area, sizeof scrubber_area) != 0)
        {
-               GdkWindow *window;
-
-               /*
-                * NOTE:
-                *
-                * Initially we had a gtk_widget_queue_draw() here thinking
-                * that we would hit the pixel cache and everything would be
-                * fine. However, it actually has a noticible improvement on
-                * interactivity to simply invalidate the old and new region
-                * in the widgets primary GdkWindow. Since the window is
-                * not the GTK_TEXT_WINDOW_TEXT, we don't seem to invalidate
-                * the pixel cache. This makes things as interactive as they
-                * were when drawing the scrubber from a parent widget.
-                */
-               window = gtk_text_view_get_window (GTK_TEXT_VIEW (map), GTK_TEXT_WINDOW_WIDGET);
-               if (window != NULL)
-               {
-                       gdk_window_invalidate_rect (window, &priv->scrubber_area, FALSE);
-                       gdk_window_invalidate_rect (window, &scrubber_area, FALSE);
-               }
-
                priv->scrubber_area = scrubber_area;
+               gtk_widget_queue_draw (GTK_WIDGET (map));
        }
 }
 
@@ -334,7 +326,7 @@ gtk_source_map_rebuild_css (GtkSourceMap *map)
        if (background == NULL)
        {
                GtkStyleContext *context;
-               GdkRGBA color;
+               GdkRGBA *color = NULL;
 
                /*
                 * We failed to locate a style for both "map-overlay" and for
@@ -348,13 +340,11 @@ gtk_source_map_rebuild_css (GtkSourceMap *map)
                gtk_style_context_save (context);
                gtk_style_context_add_class (context, "view");
                gtk_style_context_set_state (context, GTK_STATE_FLAG_SELECTED);
-               G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
-               gtk_style_context_get_background_color (context,
-                                                       gtk_style_context_get_state (context),
-                                                       &color);
-               G_GNUC_END_IGNORE_DEPRECATIONS;
+               gtk_style_context_get (context,
+                                      GTK_STYLE_PROPERTY_BACKGROUND_COLOR, &color,
+                                      NULL);
                gtk_style_context_restore (context);
-               background = gdk_rgba_to_string (&color);
+               background = gdk_rgba_to_string (color);
 
                /*
                 * Make sure we alter the alpha. It is possible this could be
@@ -362,6 +352,8 @@ gtk_source_map_rebuild_css (GtkSourceMap *map)
                 * not contain a background color.
                 */
                alter_alpha = TRUE;
+
+               gdk_rgba_free (color);
        }
 
        if (alter_alpha)
@@ -392,7 +384,7 @@ gtk_source_map_rebuild_css (GtkSourceMap *map)
 
        if (gstr->len > 0)
        {
-               gtk_css_provider_load_from_data (priv->css_provider, gstr->str, gstr->len, NULL);
+               gtk_css_provider_load_from_data (priv->css_provider, gstr->str, gstr->len);
        }
 
        g_string_free (gstr, TRUE);
@@ -568,64 +560,60 @@ gtk_source_map_set_font_name (GtkSourceMap *map,
 }
 
 static void
-gtk_source_map_get_preferred_width (GtkWidget *widget,
-                                    gint      *mininum_width,
-                                    gint      *natural_width)
+gtk_source_map_measure (GtkWidget      *widget,
+                        GtkOrientation  orientation,
+                        int             for_size,
+                        int            *minimum,
+                        int            *natural,
+                        int            *minimum_baseline,
+                        int            *natural_baseline)
 {
        GtkSourceMap *map = GTK_SOURCE_MAP (widget);
        GtkSourceMapPrivate *priv;
-       PangoLayout *layout;
-       gint height;
-       gint width;
 
        priv = gtk_source_map_get_instance_private (map);
 
-       if (priv->font_desc == NULL)
+       if (orientation == GTK_ORIENTATION_HORIZONTAL)
        {
-               *mininum_width = *natural_width = DEFAULT_WIDTH;
-               return;
+               if (priv->font_desc == NULL)
+               {
+                       *minimum = *natural = DEFAULT_WIDTH;
+               }
+               else
+               {
+                       PangoLayout *layout;
+                       gint height;
+                       gint width;
+
+                       /*
+                        * FIXME:
+                        *
+                        * This seems like the type of thing we should calculate when
+                        * rebuilding our CSS since it gets used a bunch and changes
+                        * very little.
+                        */
+                       layout = gtk_widget_create_pango_layout (GTK_WIDGET (map), "X");
+                       pango_layout_get_pixel_size (layout, &width, &height);
+                       g_object_unref (layout);
+
+                       width *= gtk_source_view_get_right_margin_position (priv->view);
+
+                       *minimum = *natural = width;
+               }
        }
-
-       /*
-        * FIXME:
-        *
-        * This seems like the type of thing we should calculate when
-        * rebuilding our CSS since it gets used a bunch and changes
-        * very little.
-        */
-       layout = gtk_widget_create_pango_layout (GTK_WIDGET (map), "X");
-       pango_layout_get_pixel_size (layout, &width, &height);
-       g_object_unref (layout);
-
-       width *= gtk_source_view_get_right_margin_position (priv->view);
-
-       *mininum_width = *natural_width = width;
-}
-
-static void
-gtk_source_map_get_preferred_height (GtkWidget *widget,
-                                     gint      *minimum_height,
-                                     gint      *natural_height)
-{
-       GtkSourceMap *map = GTK_SOURCE_MAP (widget);
-       GtkSourceMapPrivate *priv;
-
-       priv = gtk_source_map_get_instance_private (map);
-
-       if (priv->view == NULL)
+       else if (orientation == GTK_ORIENTATION_VERTICAL)
        {
-               *minimum_height = *natural_height = 0;
-               return;
+               GTK_WIDGET_CLASS (gtk_source_map_parent_class)->measure (widget,
+                                                                        orientation,
+                                                                        for_size,
+                                                                        minimum,
+                                                                        natural,
+                                                                        minimum_baseline,
+                                                                        natural_baseline);
+               *minimum = *natural = 0;
        }
-
-       GTK_WIDGET_CLASS (gtk_source_map_parent_class)->get_preferred_height (widget,
-                                                                             minimum_height,
-                                                                             natural_height);
-
-       *minimum_height = 0;
 }
 
-
 /*
  * This scrolls using buffer coordinates.
  * Translate your event location to a buffer coordinate before
@@ -655,12 +643,14 @@ scroll_to_child_point (GtkSourceMap   *map,
 }
 
 static void
-gtk_source_map_size_allocate (GtkWidget     *widget,
-                              GtkAllocation *alloc)
+gtk_source_map_size_allocate (GtkWidget *widget,
+                              int        width,
+                              int        height,
+                              int        baseline)
 {
        GtkSourceMap *map = GTK_SOURCE_MAP (widget);
 
-       GTK_WIDGET_CLASS (gtk_source_map_parent_class)->size_allocate (widget, alloc);
+       GTK_WIDGET_CLASS (gtk_source_map_parent_class)->size_allocate (widget, width, height, baseline);
 
        update_scrubber_position (map);
 }
@@ -722,16 +712,6 @@ connect_view (GtkSourceMap  *map,
                                         map,
                                         G_CONNECT_SWAPPED);
 
-       if ((gtk_widget_get_events (GTK_WIDGET (priv->view)) & GDK_ENTER_NOTIFY_MASK) == 0)
-       {
-               gtk_widget_add_events (GTK_WIDGET (priv->view), GDK_ENTER_NOTIFY_MASK);
-       }
-
-       if ((gtk_widget_get_events (GTK_WIDGET (priv->view)) & GDK_LEAVE_NOTIFY_MASK) == 0)
-       {
-               gtk_widget_add_events (GTK_WIDGET (priv->view), GDK_LEAVE_NOTIFY_MASK);
-       }
-
        /* If we are not visible, we want to block certain signal handlers */
        if (!gtk_widget_get_visible (GTK_WIDGET (map)))
        {
@@ -818,9 +798,9 @@ gtk_source_map_destroy (GtkWidget *widget)
        GTK_WIDGET_CLASS (gtk_source_map_parent_class)->destroy (widget);
 }
 
-static gboolean
-gtk_source_map_draw (GtkWidget *widget,
-                     cairo_t   *cr)
+static void
+gtk_source_map_snapshot (GtkWidget   *widget,
+                         GtkSnapshot *snapshot)
 {
        GtkSourceMap *map = GTK_SOURCE_MAP (widget);
        GtkSourceMapPrivate *priv;
@@ -828,18 +808,27 @@ gtk_source_map_draw (GtkWidget *widget,
 
        priv = gtk_source_map_get_instance_private (map);
 
-       style_context = gtk_widget_get_style_context (widget);
+       GTK_WIDGET_CLASS (gtk_source_map_parent_class)->snapshot (widget, snapshot);
 
-       GTK_WIDGET_CLASS (gtk_source_map_parent_class)->draw (widget, cr);
+       style_context = gtk_widget_get_style_context (widget);
 
        gtk_style_context_save (style_context);
        gtk_style_context_add_class (style_context, "scrubber");
-       gtk_render_background (style_context, cr,
-                              priv->scrubber_area.x, priv->scrubber_area.y,
-                              priv->scrubber_area.width, priv->scrubber_area.height);
+       gtk_snapshot_render_background (snapshot,
+                                       style_context,
+                                       priv->scrubber_area.x, priv->scrubber_area.y,
+                                       priv->scrubber_area.width, priv->scrubber_area.height);
        gtk_style_context_restore (style_context);
+}
 
-       return FALSE;
+static void
+gtk_source_map_snapshot_layer (GtkTextView      *text_view,
+                              GtkTextViewLayer  layer,
+                              GtkSnapshot      *snapshot)
+{
+       /* Avoid drawing layers from GtkSourceView. They details are
+        * too small to see and significantly slow down rendering.
+        */
 }
 
 static void
@@ -891,98 +880,66 @@ gtk_source_map_set_property (GObject      *object,
        }
 }
 
-static gboolean
-gtk_source_map_button_press_event (GtkWidget      *widget,
-                                   GdkEventButton *event)
+static void
+gtk_source_map_drag_update (GtkSourceMap   *map,
+                           gdouble         x,
+                           gdouble         y,
+                           GtkGestureDrag *drag)
 {
-       GtkSourceMap *map = GTK_SOURCE_MAP (widget);
-       GtkSourceMapPrivate *priv;
+       GtkTextBuffer *buffer;
+       GtkAllocation alloc;
+       GdkRectangle area;
+       GtkTextIter iter;
        GdkPoint point;
+       gdouble yratio;
+       gdouble begin_x;
+       gdouble begin_y;
+       gint ignored;
+       gint real_height;
+       gint height;
 
-       priv = gtk_source_map_get_instance_private (map);
+       gtk_widget_get_allocation (GTK_WIDGET (map), &alloc);
+       gtk_gesture_drag_get_start_point (drag, &begin_x, &begin_y);
+       y = CLAMP (begin_y + y, 0, alloc.height);
 
-       point.x = event->x;
-       point.y = event->y;
+       GTK_WIDGET_CLASS (gtk_source_map_parent_class)->measure (GTK_WIDGET (map),
+                                                                GTK_ORIENTATION_VERTICAL,
+                                                                gtk_widget_get_width (GTK_WIDGET (map)),
+                                                                &ignored, &real_height, &ignored, &ignored);
 
-       gtk_text_view_window_to_buffer_coords (GTK_TEXT_VIEW (map),
-                                              GTK_TEXT_WINDOW_WIDGET,
-                                              event->x, event->y,
-                                              &point.x, &point.y);
+       height = MIN (real_height, alloc.height);
 
-       scroll_to_child_point (map, &point);
+       buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (map));
+       gtk_text_buffer_get_end_iter (buffer, &iter);
+       gtk_text_view_get_iter_location (GTK_TEXT_VIEW (map), &iter, &area);
 
-       gtk_grab_add (widget);
+       yratio = CLAMP (y, 0, height) / (gdouble)height;
 
-       priv->in_press = TRUE;
+       point.x = 0;
+       point.y = real_height * yratio;
 
-       return GDK_EVENT_STOP;
+       scroll_to_child_point (map, &point);
 }
 
-static gboolean
-gtk_source_map_button_release_event (GtkWidget      *widget,
-                                     GdkEventButton *event)
+static void
+gtk_source_map_drag_begin (GtkSourceMap   *map,
+                          gdouble         start_x,
+                          gdouble         start_y,
+                          GtkGestureDrag *drag)
 {
-       GtkSourceMap *map = GTK_SOURCE_MAP (widget);
-       GtkSourceMapPrivate *priv;
-
-       priv = gtk_source_map_get_instance_private (map);
-
-       gtk_grab_remove (widget);
-
-       priv->in_press = FALSE;
-
-       return GDK_EVENT_STOP;
+       gtk_gesture_set_state (GTK_GESTURE (drag), GTK_EVENT_SEQUENCE_CLAIMED);
+       gtk_source_map_drag_update (map, 0, 0, drag);
 }
 
 
 static gboolean
-gtk_source_map_motion_notify_event (GtkWidget      *widget,
-                                    GdkEventMotion *event)
-{
-       GtkSourceMap *map = GTK_SOURCE_MAP (widget);
-       GtkSourceMapPrivate *priv;
-
-       priv = gtk_source_map_get_instance_private (map);
-
-       if (priv->in_press && (priv->view != NULL))
-       {
-               GtkTextBuffer *buffer;
-               GtkAllocation alloc;
-               GdkRectangle area;
-               GtkTextIter iter;
-               GdkPoint point;
-               gdouble yratio;
-               gint height;
-
-               gtk_widget_get_allocation (widget, &alloc);
-               gtk_widget_get_preferred_height (widget, NULL, &height);
-               if (height > 0)
-               {
-                       height = MIN (height, alloc.height);
-               }
-
-               buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (map));
-               gtk_text_buffer_get_end_iter (buffer, &iter);
-               gtk_text_view_get_iter_location (GTK_TEXT_VIEW (map), &iter, &area);
-
-               yratio = CLAMP (event->y - alloc.y, 0, height) / (gdouble)height;
-
-               point.x = 0;
-               point.y = (area.y + area.height) * yratio;
-
-               scroll_to_child_point (map, &point);
-       }
-
-       return GDK_EVENT_STOP;
-}
-
-static gboolean
-gtk_source_map_scroll_event (GtkWidget      *widget,
-                             GdkEventScroll *event)
+gtk_source_map_scroll (GtkWidget *widget,
+                       gdouble    x,
+                       gdouble    y)
 {
+       static const gint scroll_acceleration = 6;
        GtkSourceMap *map = GTK_SOURCE_MAP (widget);
        GtkSourceMapPrivate *priv;
-       static const gint scroll_acceleration = 4;
 
        priv = gtk_source_map_get_instance_private (map);
 
@@ -994,36 +951,20 @@ gtk_source_map_scroll_event (GtkWidget      *widget,
         */
        if (priv->view != NULL)
        {
-               gdouble x;
-               gdouble y;
                gint count = 0;
 
-               if (event->direction == GDK_SCROLL_UP)
-               {
-                       count = -scroll_acceleration;
-               }
-               else if (event->direction == GDK_SCROLL_DOWN)
+               if (y > 0)
                {
                        count = scroll_acceleration;
                }
-               else
+               else if (y < 0)
                {
-                       gdk_event_get_scroll_deltas ((GdkEvent *)event, &x, &y);
-
-                       if (y > 0)
-                       {
-                               count = scroll_acceleration;
-                       }
-                       else if (y < 0)
-                       {
-                               count = -scroll_acceleration;
-                       }
+                       count = -scroll_acceleration;
                }
 
                if (count != 0)
                {
-                       g_signal_emit_by_name (priv->view, "move-viewport",
-                                              GTK_SCROLL_STEPS, count);
+                       g_signal_emit_by_name (priv->view, "move-viewport", GTK_SCROLL_STEPS, count);
                        return GDK_EVENT_STOP;
                }
        }
@@ -1031,26 +972,13 @@ gtk_source_map_scroll_event (GtkWidget      *widget,
        return GDK_EVENT_PROPAGATE;
 }
 
-static void
-set_view_cursor (GtkSourceMap *map)
-{
-       GdkWindow *window;
-
-       window = gtk_text_view_get_window (GTK_TEXT_VIEW (map),
-                                          GTK_TEXT_WINDOW_TEXT);
-       if (window != NULL)
-       {
-               gdk_window_set_cursor (window, NULL);
-       }
-}
-
 static void
 gtk_source_map_state_flags_changed (GtkWidget     *widget,
                                     GtkStateFlags  flags)
 {
        GTK_WIDGET_CLASS (gtk_source_map_parent_class)->state_flags_changed (widget, flags);
 
-       set_view_cursor (GTK_SOURCE_MAP (widget));
+       gtk_widget_set_cursor (widget, NULL);
 }
 
 static void
@@ -1058,7 +986,7 @@ gtk_source_map_realize (GtkWidget *widget)
 {
        GTK_WIDGET_CLASS (gtk_source_map_parent_class)->realize (widget);
 
-       set_view_cursor (GTK_SOURCE_MAP (widget));
+       gtk_widget_set_cursor (widget, NULL);
 }
 
 static void
@@ -1108,24 +1036,22 @@ gtk_source_map_class_init (GtkSourceMapClass *klass)
 {
        GObjectClass *object_class = G_OBJECT_CLASS (klass);
        GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+       GtkTextViewClass *text_view_class = GTK_TEXT_VIEW_CLASS (klass);
 
        object_class->get_property = gtk_source_map_get_property;
        object_class->set_property = gtk_source_map_set_property;
 
        widget_class->destroy = gtk_source_map_destroy;
-       widget_class->draw = gtk_source_map_draw;
-       widget_class->get_preferred_height = gtk_source_map_get_preferred_height;
-       widget_class->get_preferred_width = gtk_source_map_get_preferred_width;
+       widget_class->snapshot = gtk_source_map_snapshot;
+       widget_class->measure = gtk_source_map_measure;
        widget_class->hide = gtk_source_map_hide;
        widget_class->size_allocate = gtk_source_map_size_allocate;
-       widget_class->button_press_event = gtk_source_map_button_press_event;
-       widget_class->button_release_event = gtk_source_map_button_release_event;
-       widget_class->motion_notify_event = gtk_source_map_motion_notify_event;
-       widget_class->scroll_event = gtk_source_map_scroll_event;
        widget_class->show = gtk_source_map_show;
        widget_class->state_flags_changed = gtk_source_map_state_flags_changed;
        widget_class->realize = gtk_source_map_realize;
 
+       text_view_class->snapshot_layer = gtk_source_map_snapshot_layer;
+
        properties[PROP_VIEW] =
                g_param_spec_object ("view",
                                     "View",
@@ -1148,7 +1074,9 @@ gtk_source_map_init (GtkSourceMap *map)
 {
        GtkSourceMapPrivate *priv;
        GtkSourceCompletion *completion;
+       GtkEventController *scroll;
        GtkStyleContext *context;
+       GtkGesture *drag;
 
        priv = gtk_source_map_get_instance_private (map);
 
@@ -1165,18 +1093,34 @@ gtk_source_map_init (GtkSourceMap *map)
                      "editable", FALSE,
                      "expand", FALSE,
                      "monospace", TRUE,
-                     "show-line-numbers", FALSE,
-                     "show-line-marks", FALSE,
                      "show-right-margin", FALSE,
                      "visible", TRUE,
                      NULL);
 
-       gtk_widget_add_events (GTK_WIDGET (map), GDK_SCROLL_MASK);
-
        completion = gtk_source_view_get_completion (GTK_SOURCE_VIEW (map));
        gtk_source_completion_block_interactive (completion);
 
-       gtk_source_map_set_font_name (map, "Monospace 1");
+       gtk_source_map_set_font_name (map, "BuilderBlocks 1");
+
+       drag = gtk_gesture_drag_new ();
+       g_signal_connect_swapped (drag,
+                                 "drag-begin",
+                                 G_CALLBACK (gtk_source_map_drag_begin),
+                                 map);
+       g_signal_connect_swapped (drag,
+                                 "drag-update",
+                                 G_CALLBACK (gtk_source_map_drag_update),
+                                 map);
+       gtk_widget_add_controller (GTK_WIDGET (map),
+                                  GTK_EVENT_CONTROLLER (g_steal_pointer (&drag)));
+
+       scroll = gtk_event_controller_scroll_new (GTK_EVENT_CONTROLLER_SCROLL_VERTICAL);
+       gtk_event_controller_set_propagation_phase (scroll, GTK_PHASE_CAPTURE);
+       g_signal_connect_swapped (scroll,
+                                 "scroll",
+                                 G_CALLBACK (gtk_source_map_scroll),
+                                 map);
+       gtk_widget_add_controller (GTK_WIDGET (map), g_steal_pointer (&scroll));
 }
 
 /**


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