1 files changed, 126 insertions, 0 deletions
diff --git a/src/interface-gtk/view.c b/src/interface-gtk/view.c
new file mode 100644
index 0000000..ef839d6
--- /dev/null
+++ b/src/interface-gtk/view.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2012-2025 Robin Haberkorn
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+
+#include <glib.h>
+
+#include <gtk/gtk.h>
+
+#include <Scintilla.h>
+#include <ScintillaWidget.h>
+
+#include "view.h"
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(ScintillaObject, g_object_unref)
+
+#define TECO_TYPE_VIEW teco_view_get_type()
+G_DECLARE_FINAL_TYPE(TecoView, teco_view, TECO, VIEW, ScintillaObject)
+
+struct _TecoView {
+	ScintillaObject parent_instance;
+	/** current size allocation */
+	GdkRectangle allocation;
+};
+
+G_DEFINE_TYPE(TecoView, teco_view, SCINTILLA_TYPE_OBJECT)
+
+static void
+teco_view_scintilla_notify_cb(ScintillaObject *sci, gint iMessage, SCNotification *notify)
+{
+	teco_view_process_notify((teco_view_t *)TECO_VIEW(sci), notify);
+}
+
+/**
+ * Called when the view is size allocated.
+ *
+ * This especially ensures that the caret is visible after startup and when
+ * opening files on specific lines.
+ * It's important to scroll the caret only when the size actually changes,
+ * so we do not interfere with mouse scrolling.
+ * That callback is invoked even if the size does not change, so that's why
+ * we have to store the current allocation in teco_view_t.
+ * Calling it once is unfortunately not sufficient since the window size
+ * can change during startup.
+ */
+static void
+teco_view_size_allocate_cb(GtkWidget *widget, GdkRectangle *allocation)
+{
+	/* chain to parent class */
+	GTK_WIDGET_CLASS(teco_view_parent_class)->size_allocate(widget, allocation);
+
+	TecoView *view = TECO_VIEW(widget);
+
+	if (allocation->width == view->allocation.width && allocation->height == view->allocation.height)
+		return;
+	teco_view_ssm((teco_view_t *)view, SCI_SCROLLCARET, 0, 0);
+	memcpy(&view->allocation, allocation, sizeof(view->allocation));
+}
+
+teco_view_t *
+teco_view_new(void)
+{
+	TecoView *ctx = TECO_VIEW(g_object_new(TECO_TYPE_VIEW, NULL));
+	/*
+	 * We don't want the object to be destroyed
+	 * when it is removed from the vbox.
+	 */
+	g_object_ref_sink(ctx);
+
+	scintilla_set_id(SCINTILLA(ctx), 0);
+
+	gtk_widget_set_size_request(GTK_WIDGET(ctx), 500, 300);
+
+	/*
+	 * This disables mouse and key events on this view.
+	 * For some strange reason, masking events on
+	 * the event box does NOT work.
+	 */
+	gtk_widget_set_can_focus(GTK_WIDGET(ctx), FALSE);
+	gint events = gtk_widget_get_events(GTK_WIDGET(ctx));
+	events &= ~(GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
+	            GDK_SCROLL_MASK |
+	            GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK);
+	gtk_widget_set_events(GTK_WIDGET(ctx), events);
+
+	return (teco_view_t *)ctx;
+}
+
+static void
+teco_view_class_init(TecoViewClass *klass)
+{
+	SCINTILLA_CLASS(klass)->notify = teco_view_scintilla_notify_cb;
+	GTK_WIDGET_CLASS(klass)->size_allocate = teco_view_size_allocate_cb;
+}
+
+static void teco_view_init(TecoView *self) {}
+
+sptr_t
+teco_view_ssm(teco_view_t *ctx, unsigned int iMessage, uptr_t wParam, sptr_t lParam)
+{
+	return scintilla_send_message(SCINTILLA(ctx), iMessage, wParam, lParam);
+}
+
+void
+teco_view_free(teco_view_t *ctx)
+{
+	g_object_unref(ctx);
+}