1 files changed, 158 insertions, 0 deletions
diff --git a/indra/llui/llchatmentionhelper.cpp b/indra/llui/llchatmentionhelper.cpp
new file mode 100644
index 0000000000..5745389a58
--- /dev/null
+++ b/indra/llui/llchatmentionhelper.cpp
@@ -0,0 +1,158 @@
+/**
+* @file llchatmentionhelper.cpp
+*
+* $LicenseInfo:firstyear=2025&license=viewerlgpl$
+* Second Life Viewer Source Code
+* Copyright (C) 2025, Linden Research, Inc.
+*
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation;
+* version 2.1 of the License only.
+*
+* This library 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
+* Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public
+* License along with this library; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*
+* Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+* $/LicenseInfo$
+*/
+
+#include "linden_common.h"
+
+#include "llchatmentionhelper.h"
+#include "llfloater.h"
+#include "llfloaterreg.h"
+#include "lluictrl.h"
+
+constexpr char CHAT_MENTION_HELPER_FLOATER[] = "chat_mention_picker";
+
+bool LLChatMentionHelper::isActive(const LLUICtrl* ctrl) const
+{
+    return mHostHandle.get() == ctrl;
+}
+
+bool LLChatMentionHelper::isCursorInNameMention(const LLWString& wtext, S32 cursor_pos, S32* mention_start_pos) const
+{
+    if (cursor_pos <= 0 || cursor_pos > static_cast<S32>(wtext.size()))
+        return false;
+
+    // Find the beginning of the current word
+    S32 start = cursor_pos - 1;
+    while (start > 0 && wtext[start - 1] != U32(' ') && wtext[start - 1] != U32('\n'))
+    {
+        --start;
+    }
+
+    if (wtext[start] != U32('@'))
+        return false;
+
+    if (mention_start_pos)
+        *mention_start_pos = start;
+
+    S32 word_length = cursor_pos - start;
+
+    if (word_length == 1)
+    {
+        return true;
+    }
+
+    // Get the name after '@'
+    std::string name = wstring_to_utf8str(wtext.substr(start + 1, word_length - 1));
+    LLStringUtil::toLower(name);
+    for (const auto& av_name : mAvatarNames)
+    {
+        if (av_name == name || av_name.find(name) == 0)
+        {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+void LLChatMentionHelper::showHelper(LLUICtrl* host_ctrl, S32 local_x, S32 local_y, const std::string& av_name, std::function<void(std::string)> cb)
+{
+    if (mHelperHandle.isDead())
+    {
+        LLFloater* av_picker_floater = LLFloaterReg::getInstance(CHAT_MENTION_HELPER_FLOATER);
+        mHelperHandle = av_picker_floater->getHandle();
+        mHelperCommitConn = av_picker_floater->setCommitCallback([&](LLUICtrl* ctrl, const LLSD& param) { onCommitName(param.asString()); });
+    }
+    setHostCtrl(host_ctrl);
+    mNameCommitCb = cb;
+
+    S32 floater_x, floater_y;
+    if (!host_ctrl->localPointToOtherView(local_x, local_y, &floater_x, &floater_y, gFloaterView))
+    {
+        LL_WARNS() << "Cannot show helper for non-floater controls." << LL_ENDL;
+        return;
+    }
+
+    LLFloater* av_picker_floater = mHelperHandle.get();
+    LLRect rect = av_picker_floater->getRect();
+    rect.setLeftTopAndSize(floater_x, floater_y + rect.getHeight(), rect.getWidth(), rect.getHeight());
+    av_picker_floater->setRect(rect);
+    if (av_picker_floater->isShown())
+    {
+        av_picker_floater->onOpen(LLSD().with("av_name", av_name));
+    }
+    else
+    {
+        av_picker_floater->openFloater(LLSD().with("av_name", av_name));
+    }
+}
+
+void LLChatMentionHelper::hideHelper(const LLUICtrl* ctrl)
+{
+    if ((ctrl && !isActive(ctrl)))
+    {
+        return;
+    }
+    setHostCtrl(nullptr);
+}
+
+bool LLChatMentionHelper::handleKey(const LLUICtrl* ctrl, KEY key, MASK mask)
+{
+    if (mHelperHandle.isDead() || !isActive(ctrl))
+    {
+        return false;
+    }
+
+    return mHelperHandle.get()->handleKey(key, mask, true);
+}
+
+void LLChatMentionHelper::onCommitName(std::string name_url)
+{
+    if (!mHostHandle.isDead() && mNameCommitCb)
+    {
+        mNameCommitCb(name_url);
+    }
+}
+
+void LLChatMentionHelper::setHostCtrl(LLUICtrl* host_ctrl)
+{
+    const LLUICtrl* pCurHostCtrl = mHostHandle.get();
+    if (pCurHostCtrl != host_ctrl)
+    {
+        mHostCtrlFocusLostConn.disconnect();
+        mHostHandle.markDead();
+        mNameCommitCb = {};
+
+        if (!mHelperHandle.isDead())
+        {
+            mHelperHandle.get()->closeFloater();
+        }
+
+        if (host_ctrl)
+        {
+            mHostHandle = host_ctrl->getHandle();
+            mHostCtrlFocusLostConn = host_ctrl->setFocusLostCallback(std::bind([&]() { hideHelper(getHostCtrl()); }));
+        }
+    }
+}