Allow zooming the font with keyboard (ctrl+-0) #9

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Switched to gtk4 to get rid of texture noise. Chunks of texts are rendered as gtk labels.
 - Capture and display service output like --help or --version in the GUI window
 - TCP session that can be engaged by recompiling currently
+- Font zoom using keyboard shortcuts `^+`, `^-`, `^0`
 
 ### Fixed
 

src/GGrid.cpp

@@ -1,13 +1,13 @@
 #include "GGrid.hpp"
 #include "Logger.hpp"
 #include "Renderer.hpp"
-#include "IMenuBarToggler.hpp"
+#include "IWindowHandler.hpp"
 #include <sstream>
 
-GGrid::GGrid(GtkWidget *grid, Session::PtrT &session, IMenuBarToggler *menu_bar_toggler)
+GGrid::GGrid(GtkWidget *grid, Session::PtrT &session, IWindowHandler *window_handler)
     : _grid{grid}
     , _session{session}
-    , _menu_bar_toggler{menu_bar_toggler}
+    , _window_handler{window_handler}
 {
     gtk_widget_set_focusable(_grid, true);
 
@@ -86,7 +86,7 @@ void GGrid::UpdateStyle()
 
     oss << "* {\n";
     oss << "font-family: Fira Code;\n";
-    oss << "font-size: 14pt;\n";
+    oss << "font-size: " << _font_size_pt << "pt;\n";
     mapAttr(renderer->GetDefAttr(), renderer->GetDefAttr());
     oss << "}\n";
 
@@ -110,6 +110,7 @@ void GGrid::UpdateStyle()
     gtk_css_provider_load_from_data(_css_provider.get(), style.data(), -1);
 
     MeasureCell();
+    _window_handler->CheckSizeAsync();
 }
 
 void GGrid::Present(int width, int height)
@@ -201,11 +202,29 @@ gboolean GGrid::_OnKeyPressed(guint keyval, guint /*keycode*/, GdkModifierType s
         return true;
     }
     _alt_pending = false;
-    _menu_bar_toggler->MenuBarHide();
+    _window_handler->MenuBarHide();
 
     if (!_session)
         return true;
 
+    if (0 != (GDK_CONTROL_MASK & state))
+    {
+        double font_size_pt = _font_size_pt;
+        if (keyval == GDK_KEY_equal)
+            font_size_pt *= 1.1;
+        else if (keyval == GDK_KEY_minus)
+            font_size_pt /= 1.1;
+        else if (keyval == GDK_KEY_0)
+            font_size_pt = 14;
+        if (font_size_pt != _font_size_pt)
+        {
+            auto guard = _session->GetRenderer()->Lock();
+            _font_size_pt = font_size_pt;
+            UpdateStyle();
+            return true;
+        }
+    }
+
     gunichar uc = gdk_keyval_to_unicode(keyval);
     auto input = MkPtr(g_string_append_unichar(g_string_new(nullptr), uc),
                                                [](GString *s) { g_string_free(s, true); });
@@ -262,7 +281,7 @@ gboolean GGrid::_OnKeyReleased(guint keyval, guint /*keycode*/, GdkModifierType
 {
     if (_alt_pending && keyval == GDK_KEY_Alt_L)
     {
-        _menu_bar_toggler->MenuBarToggle();
+        _window_handler->MenuBarToggle();
     }
     return true;
 }

src/GGrid.hpp

@@ -9,12 +9,12 @@
 #include <functional>
 #include <gtk/gtk.h>
 
-struct IMenuBarToggler;
+struct IWindowHandler;
 
 class GGrid
 {
 public:
-    GGrid(GtkWidget *grid, Session::PtrT &session, IMenuBarToggler *);
+    GGrid(GtkWidget *grid, Session::PtrT &session, IWindowHandler *);
 
     GtkStyleProvider* GetStyle() const
     {
@@ -48,7 +48,7 @@ class GGrid
 private:
     GtkWidget *_grid;
     Session::PtrT &_session;
-    IMenuBarToggler *_menu_bar_toggler;
+    IWindowHandler *_window_handler;
     PtrT<GtkCssProvider> _css_provider = NullPtr<GtkCssProvider>([](auto *p) { g_object_unref(p); });
 
     int _cell_width = 0;
@@ -65,4 +65,6 @@ class GGrid
 
     int _last_rows = 0, _last_cols = 0;
     void _CheckSize(int width, int height);
+
+    double _font_size_pt = 14;
 };

src/GWindow.cpp

@@ -39,7 +39,7 @@ GWindow::GWindow(GtkApplication *app, Session::PtrT &session)
     }
 
     // Adjust the grid size to the actual window size
-    _CheckSizeAsync();
+    CheckSizeAsync();
 }
 
 GWindow::~GWindow()
@@ -83,7 +83,7 @@ void GWindow::_SetupWindowSignals()
 {
     using SizeChangedT = gboolean (*)(GObject *, GParamSpec *, gpointer data);
     SizeChangedT sizeChanged = [](auto *, auto *, gpointer data) {
-        reinterpret_cast<GWindow *>(data)->_CheckSizeAsync();
+        reinterpret_cast<GWindow *>(data)->CheckSizeAsync();
         return FALSE;
     };
 
@@ -92,7 +92,7 @@ void GWindow::_SetupWindowSignals()
 
     using OnShowT = void (*)(GtkWidget *, gpointer);
     OnShowT onShow = [](auto *, gpointer data) {
-        reinterpret_cast<GWindow *>(data)->_CheckSizeAsync();
+        reinterpret_cast<GWindow *>(data)->CheckSizeAsync();
     };
     g_signal_connect(_window, "show", G_CALLBACK(onShow), this);
 
@@ -125,7 +125,7 @@ void GWindow::_SetupStatusLabel()
     gtk_widget_set_visible(status_label, false);
 }
 
-void GWindow::_CheckSizeAsync()
+void GWindow::CheckSizeAsync()
 {
     g_timeout_add(0, [](gpointer data) {
             reinterpret_cast<GWindow *>(data)->_CheckSize();

src/GWindow.hpp

@@ -4,15 +4,15 @@
 #include "Utils.hpp"
 #include "Session.hpp"
 #include "GGrid.hpp"
-#include "IMenuBarToggler.hpp"
+#include "IWindowHandler.hpp"
 #include <string>
 #include <memory>
 #include <gtk/gtk.h>
 
 
 class GWindow
     : public IWindow
-    , public IMenuBarToggler
+    , public IWindowHandler
 {
 public:
     GWindow(GtkApplication *, Session::PtrT &session);
@@ -38,7 +38,7 @@ class GWindow
     void _SetupWindowSignals();
     void _SetupStatusLabel();
 
-    void _CheckSizeAsync();
+    void CheckSizeAsync() override;
     void _CheckSize();
 
     void _Present();

src/IWindowHandler.hpp

@@ -0,0 +1,9 @@
+#pragma once
+
+struct IWindowHandler
+{
+    virtual ~IWindowHandler() { }
+    virtual void MenuBarToggle() = 0;
+    virtual void MenuBarHide() = 0;
+    virtual void CheckSizeAsync() = 0;
+};

src/meson.build

@@ -44,6 +44,7 @@ nvim_ui_sources = [
   'GPointer.hpp',
   'GWindow.cpp',
   'GWindow.hpp',
+  'IWindowHandler.hpp',
   gtk_res,
   win_res,
 ]