Keep IDE RightPane views alive

**Why?**
- This is needed for the Web Terminal feature.
  https://gitlab.com/gitlab-org/gitlab-ee/issues/5426

**Notes:**
- Introduces a `pane` Vuex module.
- Some views should not be kept alive (i.e. job details).
  This is why a `keepAlive` flag was introduced for views.

6 files changed, 73 insertions, 0 deletions

diff --git a/app/assets/javascripts/ide/stores/modules/pane/actions.js b/app/assets/javascripts/ide/stores/modules/pane/actions.js
new file mode 100644
index 00000000000..7f5d167a14f
--- /dev/null
+++ b/app/assets/javascripts/ide/stores/modules/pane/actions.js
@@ -0,0 +1,30 @@
+import * as types from './mutation_types';
+
+export const toggleOpen = ({ dispatch, state }, view) => {
+  if (state.isOpen) {
+    dispatch('close');
+  } else {
+    dispatch('open', view);
+  }
+};
+
+export const open = ({ commit }, view) => {
+  commit(types.SET_OPEN, true);
+
+  if (view) {
+    const { name, keepAlive } = view;
+
+    commit(types.SET_CURRENT_VIEW, name);
+
+    if (keepAlive) {
+      commit(types.KEEP_ALIVE_VIEW, name);
+    }
+  }
+};
+
+export const close = ({ commit }) => {
+  commit(types.SET_OPEN, false);
+};
+
+// prevent babel-plugin-rewire from generating an invalid default during karma tests
+export default () => {};
diff --git a/app/assets/javascripts/ide/stores/modules/pane/getters.js b/app/assets/javascripts/ide/stores/modules/pane/getters.js
new file mode 100644
index 00000000000..c346cf13689
--- /dev/null
+++ b/app/assets/javascripts/ide/stores/modules/pane/getters.js
@@ -0,0 +1,4 @@
+export const isActiveView = state => view => state.currentView === view;
+
+export const isAliveView = (state, getters) => view =>
+  state.keepAliveViews[view] || (state.isOpen && getters.isActiveView(view));
diff --git a/app/assets/javascripts/ide/stores/modules/pane/index.js b/app/assets/javascripts/ide/stores/modules/pane/index.js
new file mode 100644
index 00000000000..5f61cb732c8
--- /dev/null
+++ b/app/assets/javascripts/ide/stores/modules/pane/index.js
@@ -0,0 +1,12 @@
+import * as actions from './actions';
+import * as getters from './getters';
+import mutations from './mutations';
+import state from './state';
+
+export default () => ({
+  namespaced: true,
+  state: state(),
+  actions,
+  getters,
+  mutations,
+});
diff --git a/app/assets/javascripts/ide/stores/modules/pane/mutation_types.js b/app/assets/javascripts/ide/stores/modules/pane/mutation_types.js
new file mode 100644
index 00000000000..abdebc4d913
--- /dev/null
+++ b/app/assets/javascripts/ide/stores/modules/pane/mutation_types.js
@@ -0,0 +1,3 @@
+export const SET_OPEN = 'SET_OPEN';
+export const SET_CURRENT_VIEW = 'SET_CURRENT_VIEW';
+export const KEEP_ALIVE_VIEW = 'KEEP_ALIVE_VIEW';
diff --git a/app/assets/javascripts/ide/stores/modules/pane/mutations.js b/app/assets/javascripts/ide/stores/modules/pane/mutations.js
new file mode 100644
index 00000000000..c16484b4402
--- /dev/null
+++ b/app/assets/javascripts/ide/stores/modules/pane/mutations.js
@@ -0,0 +1,19 @@
+import * as types from './mutation_types';
+
+export default {
+  [types.SET_OPEN](state, isOpen) {
+    Object.assign(state, {
+      isOpen,
+    });
+  },
+  [types.SET_CURRENT_VIEW](state, currentView) {
+    Object.assign(state, {
+      currentView,
+    });
+  },
+  [types.KEEP_ALIVE_VIEW](state, viewName) {
+    Object.assign(state.keepAliveViews, {
+      [viewName]: true,
+    });
+  },
+};
diff --git a/app/assets/javascripts/ide/stores/modules/pane/state.js b/app/assets/javascripts/ide/stores/modules/pane/state.js
new file mode 100644
index 00000000000..353065b5735
--- /dev/null
+++ b/app/assets/javascripts/ide/stores/modules/pane/state.js
@@ -0,0 +1,5 @@
+export default () => ({
+  isOpen: false,
+  currentView: null,
+  keepAliveViews: {},
+});