widget: Add alignment properties

Add API to set how to distribute extra-grid space allocated to the
widget. Previously, vte always positioned the content at the left and top
of the allocation.

Fixes: https://gitlab.gnome.org/GNOME/vte/-/issues/337

1 files changed, 33 insertions, 0 deletions

diff --git a/src/app/app.cc b/src/app/app.cc
index 1c772718..2712ca52 100644
--- a/src/app/app.cc
+++ b/src/app/app.cc
@@ -122,6 +122,8 @@ public:
         VteCursorBlinkMode cursor_blink_mode{VTE_CURSOR_BLINK_SYSTEM};
         VteCursorShape cursor_shape{VTE_CURSOR_SHAPE_BLOCK};
         VteTextBlinkMode text_blink_mode{VTE_TEXT_BLINK_ALWAYS};
+        GtkAlign xalign{GtkAlign(-1)};
+        GtkAlign yalign{GtkAlign(-1)};
         vte::glib::RefPtr<GtkCssProvider> css{};
 
 #if VTE_GTK == 3
@@ -476,6 +478,28 @@ private:
                 return true;
         }
 
+        static gboolean
+        parse_xalign(char const* option, char const* value, void* data, GError** error)
+        {
+                auto const that = static_cast<Options*>(data);
+                auto v = int{};
+                auto const rv = that->parse_enum(GTK_TYPE_ALIGN, value, v, error);
+                if (rv)
+                        that->xalign = GtkAlign(v);
+                return rv;
+        }
+
+        static gboolean
+        parse_yalign(char const* option, char const* value, void* data, GError** error)
+        {
+                auto const that = static_cast<Options*>(data);
+                auto v = int{};
+                auto const rv = that->parse_enum(GTK_TYPE_ALIGN, value, v, error);
+                if (rv)
+                        that->yalign = GtkAlign(v);
+                return rv;
+        }
+
 public:
 
         double get_alpha() const
@@ -668,6 +692,11 @@ public:
                         { "use-theme-colors", 0, 0, G_OPTION_ARG_NONE, &use_theme_colors,
                           "Use foreground and background colors from the gtk+ theme", nullptr },
 
+                        { "xalign", 0, 0, G_OPTION_ARG_CALLBACK, (void*)parse_xalign,
+                          "Horizontal alignment (fill|start|end|center)", "ALIGN" },
+                        { "yalign", 0, 0, G_OPTION_ARG_CALLBACK, (void*)parse_yalign,
+                          "Vertical alignment (fill|start|end|center)", "ALIGN" },
+
 #if VTE_GTK == 3
                         { "no-argb-visual", 0, 0, G_OPTION_ARG_NONE, &no_argb_visual,
                           "Don't use an ARGB visual", nullptr },
@@ -2549,6 +2578,10 @@ vteapp_window_constructed(GObject *object)
         vte_terminal_set_scroll_unit_is_pixels(window->terminal, options.scroll_unit_is_pixels);
         vte_terminal_set_scrollback_lines(window->terminal, options.scrollback_lines);
         vte_terminal_set_text_blink_mode(window->terminal, options.text_blink_mode);
+        if (options.xalign != GtkAlign(-1))
+            vte_terminal_set_xalign(window->terminal, options.xalign);
+        if (options.yalign != GtkAlign(-1))
+            vte_terminal_set_yalign(window->terminal, options.yalign);
 
         /* Style */
         if (options.font_string != nullptr) {