1 files changed, 172 insertions, 0 deletions
diff --git a/src/message-stack.cpp b/src/message-stack.cpp
new file mode 100644
index 0000000..cebd5f2
--- /dev/null
+++ b/src/message-stack.cpp
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MessageStack - manages stack of active status messages
+ *
+ * Authors:
+ *   MenTaLguY <mental@rydia.net>
+ *
+ * Copyright (C) 2004 MenTaLguY
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cstring>
+#include <glib.h>
+#include <cstring>
+#include "message-stack.h"
+
+namespace Inkscape {
+
+MessageStack::MessageStack()
+: _messages(nullptr), _next_id(1)
+{
+}
+
+MessageStack::~MessageStack()
+{
+    while (_messages) {
+        _messages = _discard(_messages);
+    }
+}
+
+MessageId MessageStack::push(MessageType type, gchar const *message) {
+    return _push(type, 0, message);
+}
+
+MessageId MessageStack::pushF(MessageType type, gchar const *format, ...)
+{
+    va_list args;
+    va_start(args, format);
+    MessageId id=pushVF(type, format, args);
+    va_end(args);
+    return id;
+}
+
+MessageId MessageStack::pushVF(MessageType type, gchar const *format, va_list args)
+{
+    MessageId id;
+    gchar *message=g_strdup_vprintf(format, args);
+    id = push(type, message);
+    g_free(message);
+    return id;
+}
+
+void MessageStack::cancel(MessageId id) {
+    Message **ref;
+    for ( ref = &_messages ; *ref ; ref = &(*ref)->next ) {
+        if ( (*ref)->id == id ) {
+            *ref = _discard(*ref);
+            _emitChanged();
+            break;
+        }
+    }
+}
+
+MessageId MessageStack::flash(MessageType type, Glib::ustring const &message)
+{
+    MessageId id = flash( type, message.c_str() );
+    return id;
+}
+
+MessageId MessageStack::flash(MessageType type, gchar const *message) {
+    switch (type) {
+    case INFORMATION_MESSAGE: // stay rather long so as to seem permanent, but eventually disappear
+        return _push(type, 6000 + 80*strlen(message), message);
+        break;
+    case ERROR_MESSAGE: // pretty important stuff, but temporary
+        return _push(type, 4000 + 60*strlen(message), message);
+        break;
+    case WARNING_MESSAGE: // a bit less important than error
+        return _push(type, 2000 + 40*strlen(message), message);
+        break;
+    case IMMEDIATE_MESSAGE: // same length as normal, higher priority
+        return _push(type, 1000 + 20*strlen(message), message);
+        break;
+    case NORMAL_MESSAGE: // something ephemeral
+    default:
+        return _push(type, 1000 + 20*strlen(message), message);
+        break;
+    }
+}
+
+MessageId MessageStack::flashF(MessageType type, gchar const *format, ...) {
+    va_list args;
+    va_start(args, format);
+    MessageId id = flashVF(type, format, args);
+    va_end(args);
+    return id;
+}
+
+MessageId MessageStack::flashVF(MessageType type, gchar const *format, va_list args)
+{
+    gchar *message=g_strdup_vprintf(format, args);
+    MessageId id = flash(type, message);
+    g_free(message);
+    return id;
+}
+
+MessageId MessageStack::_push(MessageType type, guint lifetime, gchar const *message)
+{
+    Message *m=new Message;
+    MessageId id=_next_id++;
+
+    m->stack = this;
+    m->id = id;
+    m->type = type;
+    m->message = g_strdup(message);
+
+    if (lifetime) {
+        m->timeout_id = g_timeout_add(lifetime, &MessageStack::_timeout, m);
+    } else {
+        m->timeout_id = 0;
+    }
+
+    m->next = _messages;
+    _messages = m;
+
+    _emitChanged();
+
+    return id;
+}
+
+MessageStack::Message *MessageStack::_discard(MessageStack::Message *m)
+{
+    Message *next=m->next;
+    if (m->timeout_id) {
+        g_source_remove(m->timeout_id);
+        m->timeout_id = 0;
+    }
+    g_free(m->message);
+    m->message = nullptr;
+    m->stack = nullptr;
+    delete m;
+    return next;
+}
+
+void MessageStack::_emitChanged() {
+    if (_messages) {
+        _changed_signal.emit(_messages->type, _messages->message);
+    } else {
+        _changed_signal.emit(NORMAL_MESSAGE, nullptr);
+    }
+}
+
+gboolean MessageStack::_timeout(gpointer data) {
+    Message *m=reinterpret_cast<Message *>(data);
+    m->timeout_id = 0;
+    m->stack->cancel(m->id);
+    return FALSE;
+}
+
+}
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :