gestures: add live pinch cursor zoom (#14049)

2 files changed, 57 insertions, 5 deletions

diff --git a/src/managers/input/trackpad/gestures/CursorZoomGesture.cpp b/src/managers/input/trackpad/gestures/CursorZoomGesture.cpp
index 515edbb6..418b8f7a 100644
--- a/src/managers/input/trackpad/gestures/CursorZoomGesture.cpp
+++ b/src/managers/input/trackpad/gestures/CursorZoomGesture.cpp
@@ -2,19 +2,40 @@
 
 #include "../../../../Compositor.hpp"
 #include "../../../../helpers/Monitor.hpp"
+#include "../../../../managers/input/InputManager.hpp"
+#include <hyprutils/string/Numeric.hpp>
 
 CCursorZoomTrackpadGesture::CCursorZoomTrackpadGesture(const std::string& first, const std::string& second) {
-    try {
-        m_zoomValue = std::stof(first);
-    } catch (...) { ; }
+    if (const auto n = Hyprutils::String::strToNumber<float>(first); n)
+        m_zoomValue = n.value();
 
     if (second == "mult")
         m_mode = MODE_MULT;
+    else if (second == "live")
+        m_mode = MODE_LIVE;
 }
 
 void CCursorZoomTrackpadGesture::begin(const ITrackpadGesture::STrackpadGestureBegin& e) {
     ITrackpadGesture::begin(e);
 
+    if (m_mode == MODE_LIVE) {
+        if (!e.pinch)
+            return;
+
+        m_monitor = g_pCompositor->getMonitorFromCursor();
+        if (!m_monitor)
+            return;
+
+        const auto PMONITOR = m_monitor.lock();
+        if (!PMONITOR)
+            return;
+
+        m_zoomBegin = std::clamp(PMONITOR->m_cursorZoom->value(), 1.0F, 100.0F);
+        PMONITOR->m_cursorZoom->setValueAndWarp(m_zoomBegin);
+        PMONITOR->m_zoomController.pinAnchor(g_pInputManager->getMouseCoordsInternal() - PMONITOR->m_position);
+        return;
+    }
+
     if (m_mode == MODE_TOGGLE)
         m_zoomed = !m_zoomed;
 
@@ -25,9 +46,35 @@ void CCursorZoomTrackpadGesture::begin(const ITrackpadGesture::STrackpadGestureB
                 *m->m_cursorZoom        = m_zoomed ? m_zoomValue : *PZOOMFACTOR;
                 break;
             case MODE_MULT: *m->m_cursorZoom = std::clamp(m->m_cursorZoom->goal() * m_zoomValue, 1.0F, 100.0F); break;
+            case MODE_LIVE: break;
         }
     }
 }
 
-void CCursorZoomTrackpadGesture::update(const ITrackpadGesture::STrackpadGestureUpdate& e) {}
-void CCursorZoomTrackpadGesture::end(const ITrackpadGesture::STrackpadGestureEnd& e) {}
+void CCursorZoomTrackpadGesture::update(const ITrackpadGesture::STrackpadGestureUpdate& e) {
+    if (m_mode != MODE_LIVE || !m_monitor || !e.pinch)
+        return;
+
+    const auto PMONITOR = m_monitor.lock();
+    if (!PMONITOR)
+        return;
+
+    auto zoom = std::clamp(m_zoomBegin * static_cast<float>(e.pinch->scale), 1.0F, 100.0F);
+
+    if (zoom < 1.05F)
+        zoom = 1.0F;
+
+    PMONITOR->m_cursorZoom->setValueAndWarp(zoom);
+}
+
+void CCursorZoomTrackpadGesture::end(const ITrackpadGesture::STrackpadGestureEnd& e) {
+    if (m_mode != MODE_LIVE || !m_monitor)
+        return;
+
+    const auto PMONITOR = m_monitor.lock();
+    if (!PMONITOR)
+        return;
+
+    PMONITOR->m_zoomController.clearAnchor();
+    m_monitor.reset();
+}
diff --git a/src/managers/input/trackpad/gestures/CursorZoomGesture.hpp b/src/managers/input/trackpad/gestures/CursorZoomGesture.hpp
index b53c81e9..3def907f 100644
--- a/src/managers/input/trackpad/gestures/CursorZoomGesture.hpp
+++ b/src/managers/input/trackpad/gestures/CursorZoomGesture.hpp
@@ -2,6 +2,8 @@
 
 #include "ITrackpadGesture.hpp"
 
+#include "../../../../desktop/DesktopTypes.hpp"
+
 class CCursorZoomTrackpadGesture : public ITrackpadGesture {
   public:
     CCursorZoomTrackpadGesture(const std::string& zoomLevel, const std::string& mode);
@@ -14,10 +16,13 @@ class CCursorZoomTrackpadGesture : public ITrackpadGesture {
   private:
     float              m_zoomValue = 1.0;
     inline static bool m_zoomed    = false;
+    PHLMONITORREF      m_monitor;
+    float              m_zoomBegin = 1.0;
 
     enum eMode : uint8_t {
         MODE_TOGGLE = 0,
         MODE_MULT,
+        MODE_LIVE,
     };
 
     eMode m_mode = MODE_TOGGLE;