--- /dev/null
+Hi All,
+ The attached patch lets etk_scrolled_view been dragable with
+pressing on the panel directly and drag. If you drag fast, after
+releasing the panel will still scrolling until it stop slowly.
+
+Adding the following functions.
+void etk_scrolled_view_dragable_set(Etk_Scrolled_View
+*scrolled_view, Etk_Bool dragable);
+Etk_Bool etk_scrolled_view_dragable_get(Etk_Scrolled_View *scrolled_view);
+
+additional functions for detail control. (Most user don't need them)
+double
+etk_scrolled_view_drag_sample_interval_magic_set(Etk_Scrolled_View
+*scrolled_view,double interval);
+double
+etk_scrolled_view_drag_sample_interval_magic_get(Etk_Scrolled_View
+*scrolled_view);
+unsigned int etk_scrolled_view_drag_damping_magic_set(Etk_Scrolled_View
+*scrolled_view,unsigned int damping);
+unsigned int etk_scrolled_view_drag_damping_magic_get(Etk_Scrolled_View
+*scrolled_view);
+
+You can test this with etk_test after patching and adding two line in
+etk_test
+
+Signed-off: Tick @ openmoko.org
+
+Index: etk/src/lib/etk_scrolled_view.c
+===================================================================
+--- etk.orig/src/lib/etk_scrolled_view.c 2008-04-02 11:53:32.000000000 +0800
++++ etk/src/lib/etk_scrolled_view.c 2008-04-05 00:41:47.000000000 +0800
+@@ -37,7 +37,15 @@
+ static Etk_Bool _etk_scrolled_view_child_added_cb(Etk_Object *object, void *child, void *data);
+ static Etk_Bool _etk_scrolled_view_child_removed_cb(Etk_Object *object, void *child, void *data);
+ static Etk_Bool _etk_scrolled_view_child_scroll_size_changed_cb(Etk_Object *object, void *data);
++static int _etk_scrolled_view_motive_bounce(void *data);
+
++
++static Etk_Bool _etk_scrolled_view_mouse_down(Etk_Object *object, Etk_Event_Mouse_Down *event, void *data);
++static Etk_Bool _etk_scrolled_view_mouse_up(Etk_Object *object, Etk_Event_Mouse_Up *event, void *data);
++static Etk_Bool _etk_scrolled_view_mouse_click(Etk_Object *object, Etk_Event_Mouse_Up *event, void *data);
++static Etk_Bool _etk_scrolled_view_mouse_move(Etk_Object *object, Etk_Event_Mouse_Move *event, void *data);
++
++static Etk_Bool _etk_scrolled_view_bar_mouse_down(Etk_Object *object, Etk_Event_Mouse_Down *event, void *data);
+ /**************************
+ *
+ * Implementation
+@@ -173,6 +181,106 @@
+ *vpolicy = scrolled_view ? scrolled_view->vpolicy : ETK_POLICY_AUTO;
+ }
+
++/**
++ * @brief Set the scrolled view dragable or not
++ * @param scrolled_view a scrolled view
++ * @param dragable The scrolled view is dragable or not?
++ */
++void etk_scrolled_view_dragable_set(Etk_Scrolled_View *scrolled_view, Etk_Bool dragable)
++{
++ if (!scrolled_view)
++ return;
++ scrolled_view->drag.dragable = dragable;
++}
++
++/**
++ * @brief Get the scrolled view dragable flag
++ * @param scrolled_view a scrolled view
++ * @return Returns ETK_TURE if the scrolled view is dragable
++ */
++Etk_Bool etk_scrolled_view_dragable_get(Etk_Scrolled_View *scrolled_view)
++{
++ if (!scrolled_view)
++ return ETK_FALSE;
++ return scrolled_view->drag.dragable;
++}
++
++/**
++ * @brief Set the scrolled view boucy or not.
++ * @param scrolled_view a scrolled view
++ * @param bouncy The scrolled view is bouncy or not (Default TRUE)
++ */
++void etk_scrolled_view_drag_bouncy_set(Etk_Scrolled_View *scrolled_view, Etk_Bool bouncy)
++{
++ if (!scrolled_view)
++ return;
++ scrolled_view->drag.bouncy = bouncy;
++}
++
++/**
++ * @brief Get the scrolled view bouncy flag
++ * @param scrolled_view a scrolled view
++ * @return Returns ETK_TURE if the scrolled view is bouncy
++ */
++Etk_Bool etk_scrolled_view_drag_bouncy_get(Etk_Scrolled_View *scrolled_view)
++{
++ if (!scrolled_view)
++ return ETK_FALSE;
++ return scrolled_view->drag.bouncy;
++}
++
++/**
++ * @brief Set the scrolled view sample interval to calculate the scrolling speed.
++ * @param scrolled_view a scrolled view
++ * @param interval The interval of sampling latest scrolling speed (minimial 0.2 second, default 0.5 second)
++ * @return Returns the actual sampling interval set. If scrolled_view is NULL returns 0.0f.
++ */
++double etk_scrolled_view_drag_sample_interval_magic_set(Etk_Scrolled_View *scrolled_view,double interval)
++{
++ if (!scrolled_view)
++ return 0.0f;
++ interval = interval >= 0.2f ? interval : 0.2f;
++ scrolled_view->drag.sample_magic = interval;
++ return scrolled_view->drag.sample_magic;
++}
++
++/**
++ * @brief Get the scrolled view sample interval to calculate the scrolling speed.
++ * @param scrolled_view a scrolled view
++ * @return Returns the sampling interval. If scrolled_view is NULL return 0.0f.
++ */
++double etk_scrolled_view_drag_sample_interval_magic_get(Etk_Scrolled_View *scrolled_view)
++{
++ if (!scrolled_view)
++ return 0.0f;
++ return scrolled_view->drag.sample_magic;
++}
++
++/**
++ * @brief Set the damping magic number of a dragable scrolled view
++ * @param scrolled_view a scrolled view
++ * @param damping The damping factor of the dragable scrolled view (default 100)
++ * @return Returns the actual damping factor set
++ */
++unsigned int etk_scrolled_view_drag_damping_magic_set(Etk_Scrolled_View *scrolled_view,unsigned int damping)
++{
++ if (!scrolled_view)
++ return 0;
++ scrolled_view->drag.damping_magic = damping;
++ return scrolled_view->drag.damping_magic;
++}
++
++/**
++ * @brief Get the damping magic number of a dragable scrolled view
++ * @param scrolled_view a scrolled view
++ * @return Returns the actual damping factor
++ */
++unsigned int etk_scrolled_view_drag_damping_magic_get(Etk_Scrolled_View *scrolled_view)
++{
++ if (!scrolled_view)
++ return 0;
++ return scrolled_view->drag.damping_magic;
++}
+
+ /**************************
+ *
+@@ -189,6 +297,14 @@
+ scrolled_view->hpolicy = ETK_POLICY_AUTO;
+ scrolled_view->vpolicy = ETK_POLICY_AUTO;
+
++ scrolled_view->drag.bar_pressed = ETK_FALSE;
++ scrolled_view->drag.dragable = ETK_FALSE;
++ scrolled_view->drag.bouncy = ETK_TRUE;
++
++ // FIXME This can be put in etk_config (Make whole system be configured)
++ etk_scrolled_view_drag_sample_interval_magic_set(scrolled_view,0.5f);
++ etk_scrolled_view_drag_damping_magic_set(scrolled_view,100);
++
+ scrolled_view->hscrollbar = etk_hscrollbar_new(0.0, 0.0, 0.0, 12.0, 50.0, 0.0);
+ etk_widget_theme_parent_set(scrolled_view->hscrollbar, ETK_WIDGET(scrolled_view));
+ etk_widget_parent_set(scrolled_view->hscrollbar, ETK_WIDGET(scrolled_view));
+@@ -205,11 +321,18 @@
+ ETK_WIDGET(scrolled_view)->size_allocate = _etk_scrolled_view_size_allocate;
+
+ etk_signal_connect_by_code(ETK_WIDGET_KEY_DOWN_SIGNAL, ETK_OBJECT(scrolled_view), ETK_CALLBACK(_etk_scrolled_view_key_down_cb), NULL);
++ etk_signal_connect_by_code(ETK_WIDGET_MOUSE_DOWN_SIGNAL, ETK_OBJECT(scrolled_view), ETK_CALLBACK(_etk_scrolled_view_mouse_down), &scrolled_view->drag);
++ etk_signal_connect_by_code(ETK_WIDGET_MOUSE_UP_SIGNAL, ETK_OBJECT(scrolled_view), ETK_CALLBACK(_etk_scrolled_view_mouse_up), &scrolled_view->drag);
++ etk_signal_connect_by_code(ETK_WIDGET_MOUSE_CLICK_SIGNAL, ETK_OBJECT(scrolled_view), ETK_CALLBACK(_etk_scrolled_view_mouse_click), &scrolled_view->drag);
++ etk_signal_connect_by_code(ETK_WIDGET_MOUSE_MOVE_SIGNAL, ETK_OBJECT(scrolled_view), ETK_CALLBACK(_etk_scrolled_view_mouse_move), &scrolled_view->drag);
+ etk_signal_connect_by_code(ETK_WIDGET_MOUSE_WHEEL_SIGNAL, ETK_OBJECT(scrolled_view), ETK_CALLBACK(_etk_scrolled_view_mouse_wheel), NULL);
+ etk_signal_connect_by_code(ETK_CONTAINER_CHILD_ADDED_SIGNAL, ETK_OBJECT(scrolled_view), ETK_CALLBACK(_etk_scrolled_view_child_added_cb), NULL);
+ etk_signal_connect_by_code(ETK_CONTAINER_CHILD_REMOVED_SIGNAL, ETK_OBJECT(scrolled_view), ETK_CALLBACK(_etk_scrolled_view_child_removed_cb), NULL);
+ etk_signal_connect_by_code(ETK_RANGE_VALUE_CHANGED_SIGNAL, ETK_OBJECT(scrolled_view->hscrollbar), ETK_CALLBACK(_etk_scrolled_view_hscrollbar_value_changed_cb), scrolled_view);
++ etk_signal_connect_by_code(ETK_WIDGET_MOUSE_DOWN_SIGNAL, ETK_OBJECT(scrolled_view->hscrollbar), ETK_CALLBACK(_etk_scrolled_view_bar_mouse_down), scrolled_view);
+ etk_signal_connect_by_code(ETK_RANGE_VALUE_CHANGED_SIGNAL, ETK_OBJECT(scrolled_view->vscrollbar), ETK_CALLBACK(_etk_scrolled_view_vscrollbar_value_changed_cb), scrolled_view);
++ etk_signal_connect_by_code(ETK_WIDGET_MOUSE_DOWN_SIGNAL, ETK_OBJECT(scrolled_view->vscrollbar), ETK_CALLBACK(_etk_scrolled_view_bar_mouse_down), scrolled_view);
++
+ }
+
+ /* Sets the property whose id is "property_id" to the value "value" */
+@@ -390,6 +513,94 @@
+ etk_widget_size_allocate(child, child_geometry);
+ }
+
++/* Check if reaching the boundary */
++static inline double _etk_scrolled_view_bounce_check (Etk_Range * range, double delta,double v)
++{
++ double pos = (range->value + delta);
++ if (pos <= range->lower)
++ {
++ pos = range->lower + (range->lower - pos);
++ v *= -1;
++ }
++ etk_range_value_set(range, pos);
++ if (pos > range->value)
++ v *= -1;
++ return v;
++}
++
++/* Animator for inertial scrolling */
++static int _etk_scrolled_view_motive_bounce(void *data)
++{
++ Etk_Scrolled_View *scrolled_view = ETK_SCROLLED_VIEW(data);
++ struct Etk_Scrolled_View_Mouse_Drag *drag;
++ Etk_Range *vscrollbar_range;
++ Etk_Range *hscrollbar_range;
++ double delta_time;
++ double delta_V;
++ double delta_x;
++ double delta_y;
++ if (!scrolled_view)
++ return 0;
++ drag = &scrolled_view->drag;
++ if (drag->mouse_down)
++ return 0;
++
++ // Using trapezoid method to calculate the distance.
++ delta_time = ecore_time_get() - drag->timestamp;
++ delta_V = delta_time * (drag->damping_magic + abs(drag->Vx)+ abs(drag->Vy))/2;
++ delta_time = delta_time < 0.01f ? 0.01f: delta_time;
++
++ if (drag->Vx < delta_V && drag->Vx > -delta_V)
++ {
++ delta_x = 0;
++ drag->Vx = 0;
++ }
++ else if (drag->Vx > 0)
++ {
++ delta_x = ((drag->Vx * 2) - delta_V) * delta_time / 2;
++ drag->Vx = drag->Vx - delta_V;
++ }
++ else
++ {
++ delta_x = ((drag->Vx * 2) + delta_V) * delta_time / 2;
++ drag->Vx = drag->Vx + delta_V;
++ }
++
++ if (drag->Vy < delta_V && drag->Vy > -delta_V)
++ {
++ drag->Vy = 0;
++ delta_y = 0;
++ }
++ else if(drag->Vy > 0)
++ {
++ delta_y = ((drag->Vy * 2) - delta_V) * delta_time / 2;
++ drag->Vy = drag->Vy - delta_V;
++ } else
++ {
++ delta_y = ((drag->Vy * 2) + delta_V) * delta_time / 2;
++ drag->Vy = drag->Vy + delta_V;
++ }
++
++ if (drag->Vx == 0 && drag->Vy == 0)
++ return 0;
++
++ vscrollbar_range = ETK_RANGE(scrolled_view->vscrollbar);
++ hscrollbar_range = ETK_RANGE(scrolled_view->hscrollbar);
++ if (drag->bouncy)
++ {
++ drag->Vx = _etk_scrolled_view_bounce_check(hscrollbar_range, delta_x, drag->Vx);
++ drag->Vy = _etk_scrolled_view_bounce_check(vscrollbar_range, delta_y, drag->Vy);
++ }
++ else
++ {
++ drag->Vx = drag->Vx == _etk_scrolled_view_bounce_check(hscrollbar_range, delta_x, drag->Vx) ? drag->Vx : 0.0f;
++ drag->Vy = drag->Vy == _etk_scrolled_view_bounce_check(vscrollbar_range, delta_y, drag->Vy) ? drag->Vy : 0.0f;
++ }
++ drag->timestamp = ecore_time_get();
++ return 1;
++}
++
++
+ /**************************
+ *
+ * Callbacks and handlers
+@@ -431,6 +642,135 @@
+ return propagate;
+ }
+
++/* Called when mouse button has been pressed down */
++static Etk_Bool _etk_scrolled_view_mouse_down(Etk_Object *object, Etk_Event_Mouse_Down *event, void *data)
++{
++ Etk_Scrolled_View *scrolled_view;
++ Etk_Range *vscrollbar_range;
++ Etk_Range *hscrollbar_range;
++ struct Etk_Scrolled_View_Mouse_Drag *drag = (struct Etk_Scrolled_View_Mouse_Drag *) data;
++
++ if (!(scrolled_view = ETK_SCROLLED_VIEW(object)))
++ return ETK_FALSE;
++
++ if (!drag->dragable)
++ return ETK_FALSE;
++
++ if (!drag->mouse_down && event->button)
++ {
++ vscrollbar_range = ETK_RANGE(scrolled_view->vscrollbar);
++ hscrollbar_range = ETK_RANGE(scrolled_view->hscrollbar);
++ drag->mouse_down = ETK_TRUE;
++ drag->timestamp = ecore_time_get();
++ drag->old_timestamp = 0.0f;
++ drag->position = event->widget;
++ drag->bar_position.x = hscrollbar_range->value;
++ drag->bar_position.y = vscrollbar_range->value;
++ }
++ return ETK_FALSE;
++}
++
++/* Called when mouse is dragging */
++static Etk_Bool _etk_scrolled_view_mouse_move(Etk_Object *object, Etk_Event_Mouse_Move *event, void *data)
++{
++ Etk_Scrolled_View *scrolled_view;
++ Etk_Range *vscrollbar_range;
++ Etk_Range *hscrollbar_range;
++ double delta_time;
++ struct Etk_Scrolled_View_Mouse_Drag *drag = (struct Etk_Scrolled_View_Mouse_Drag *) data;
++
++ if (!(scrolled_view = ETK_SCROLLED_VIEW(object)))
++ return ETK_FALSE;
++
++ if (!drag->dragable)
++ return ETK_FALSE;
++
++ if (!drag->mouse_down)
++ return ETK_FALSE;
++
++ if (!event->buttons)
++ return ETK_FALSE;
++
++ vscrollbar_range = ETK_RANGE(scrolled_view->vscrollbar);
++ hscrollbar_range = ETK_RANGE(scrolled_view->hscrollbar);
++ if (drag->scroll_flag == 0)
++ {
++ drag->scroll_flag = (event->cur.widget.y - drag->position.y)/vscrollbar_range->step_increment || (event->cur.widget.x - drag->position.x)/hscrollbar_range->step_increment;
++ }
++
++ if (drag->scroll_flag)
++ {
++ if (drag->bar_pressed==ETK_FALSE)
++ {
++ etk_range_value_set(vscrollbar_range, vscrollbar_range->value - (event->cur.widget.y - drag->position.y));
++ etk_range_value_set(hscrollbar_range, hscrollbar_range->value - (event->cur.widget.x - drag->position.x));
++ }
++ drag->position = event->cur.widget;
++ delta_time = ecore_time_get() - drag->timestamp;
++ // in case delta_time is zero
++ delta_time = delta_time == 0.0f ? drag->sample_magic : delta_time;
++ if (delta_time > drag->sample_magic || drag->old_timestamp == 0)
++ {
++ drag->old_timestamp = drag->timestamp;
++ drag->timestamp = ecore_time_get();
++ drag->Vx = (hscrollbar_range->value - drag->bar_position.x) / delta_time;
++ drag->Vy = (vscrollbar_range->value - drag->bar_position.y) / delta_time;
++ drag->bar_position.x = hscrollbar_range->value;
++ drag->bar_position.y = vscrollbar_range->value;
++ }
++ return ETK_TRUE;
++ }
++ return ETK_FALSE;
++}
++
++/* Called when mouse button has been released */
++static Etk_Bool _etk_scrolled_view_mouse_up(Etk_Object *object, Etk_Event_Mouse_Up *event, void *data)
++{
++ Etk_Scrolled_View *scrolled_view;
++ struct Etk_Scrolled_View_Mouse_Drag *drag = (struct Etk_Scrolled_View_Mouse_Drag *) data;
++
++ if (!(scrolled_view = ETK_SCROLLED_VIEW(object)))
++ return ETK_FALSE;
++
++ if (!drag->dragable)
++ return ETK_FALSE;
++
++ if (!drag->mouse_down)
++ return ETK_FALSE;
++
++ if (drag->bar_pressed == ETK_TRUE)
++ {
++ drag->bar_pressed = ETK_FALSE;
++ return ETK_FALSE;
++ }
++
++ drag->mouse_down = ETK_FALSE;
++
++ if (drag->scroll_flag)
++ {
++ drag->timestamp = ecore_time_get();
++ ecore_animator_add(&_etk_scrolled_view_motive_bounce, scrolled_view);
++ return ETK_TRUE;
++ }
++ return ETK_FALSE;
++}
++
++/* Called when mouse button has been clicked */
++static Etk_Bool _etk_scrolled_view_mouse_click (Etk_Object *object, Etk_Event_Mouse_Up *event, void *data)
++{
++ Etk_Scrolled_View *scrolled_view;
++ struct Etk_Scrolled_View_Mouse_Drag *drag = (struct Etk_Scrolled_View_Mouse_Drag *) data;
++ if (!(scrolled_view = ETK_SCROLLED_VIEW(object)))
++ return ETK_TRUE;
++
++ if (drag->scroll_flag)
++ {
++ drag->scroll_flag = 0;
++ return ETK_TRUE;
++ }
++ return ETK_FALSE;
++}
++
+ /* Called when the user wants to scroll the scrolled view with the mouse wheel */
+ static Etk_Bool _etk_scrolled_view_mouse_wheel(Etk_Object *object, Etk_Event_Mouse_Wheel *event, void *data)
+ {
+@@ -458,6 +798,18 @@
+ return ETK_TRUE;
+ }
+
++/* Called when dragging on the scrollbar */
++static Etk_Bool _etk_scrolled_view_bar_mouse_down(Etk_Object *object, Etk_Event_Mouse_Down *event, void *data)
++{
++ Etk_Scrolled_View *scrolled_view;
++ Etk_Widget *child;
++ if (!(scrolled_view = ETK_SCROLLED_VIEW(data)) || !(child = ETK_BIN(scrolled_view)->child) || !child->scroll)
++ return ETK_FALSE;
++ scrolled_view->drag.bar_pressed = ETK_TRUE;
++ return ETK_FALSE;
++}
++
++
+ /* Called when the value of the vscrollbar has changed */
+ static Etk_Bool _etk_scrolled_view_vscrollbar_value_changed_cb(Etk_Object *object, double value, void *data)
+ {
+Index: etk/src/lib/etk_scrolled_view.h
+===================================================================
+--- etk.orig/src/lib/etk_scrolled_view.h 2008-04-02 11:53:32.000000000 +0800
++++ etk/src/lib/etk_scrolled_view.h 2008-04-05 00:03:31.000000000 +0800
+@@ -33,9 +33,24 @@
+ ETK_POLICY_AUTO, /**< The scrollbar is shown and hidden automatically whether or not the child can fit
+ * entirely in the scrolled view */
+ ETK_POLICY_SHOW, /**< The scrollbar is always visible */
+- ETK_POLICY_HIDE /**< The scrollbar is always hidden */
++ ETK_POLICY_HIDE, /**< The scrollbar is always hidden */
+ } Etk_Scrolled_View_Policy;
+
++struct Etk_Scrolled_View_Mouse_Drag
++{
++ Etk_Bool mouse_down;
++ Etk_Bool bar_pressed;
++ Etk_Bool dragable;
++ Etk_Bool bouncy;
++ int scroll_flag;
++ Etk_Position position;
++ Etk_Position bar_position;
++ double sample_magic;
++ unsigned int damping_magic;
++ double timestamp;
++ double old_timestamp;
++ double Vx,Vy;
++};
+
+ /**
+ * @brief @widget The structure of a scrolled view
+@@ -52,9 +67,12 @@
+
+ Etk_Scrolled_View_Policy hpolicy;
+ Etk_Scrolled_View_Policy vpolicy;
++
++ struct Etk_Scrolled_View_Mouse_Drag drag;
+ };
+
+
++
+ Etk_Type *etk_scrolled_view_type_get(void);
+ Etk_Widget *etk_scrolled_view_new(void);
+
+@@ -63,6 +81,14 @@
+ void etk_scrolled_view_add_with_viewport(Etk_Scrolled_View *scrolled_view, Etk_Widget *child);
+ void etk_scrolled_view_policy_set(Etk_Scrolled_View *scrolled_view, Etk_Scrolled_View_Policy hpolicy, Etk_Scrolled_View_Policy vpolicy);
+ void etk_scrolled_view_policy_get(Etk_Scrolled_View *scrolled_view, Etk_Scrolled_View_Policy *hpolicy, Etk_Scrolled_View_Policy *vpolicy);
++void etk_scrolled_view_dragable_set(Etk_Scrolled_View *scrolled_view, Etk_Bool dragable);
++Etk_Bool etk_scrolled_view_dragable_get(Etk_Scrolled_View *scrolled_view);
++void etk_scrolled_view_drag_bouncy_set(Etk_Scrolled_View *scrolled_view, Etk_Bool bouncy);
++Etk_Bool etk_scrolled_view_drag_bouncy_get(Etk_Scrolled_View *scrolled_view);
++double etk_scrolled_view_drag_sample_interval_magic_set(Etk_Scrolled_View *scrolled_view,double interval);
++double etk_scrolled_view_drag_sample_interval_magic_get(Etk_Scrolled_View *scrolled_view);
++unsigned int etk_scrolled_view_drag_damping_magic_set(Etk_Scrolled_View *scrolled_view,unsigned int damping);
++unsigned int etk_scrolled_view_drag_damping_magic_get(Etk_Scrolled_View *scrolled_view);
+
+ /** @} */
+
git.openpandora.org / openembedded.git / commitdiff